Christianity in the 2nd century

The second century of Christianity was largely the time of the Apostolic Fathers who were the students of the apostles of Jesus, though there is some overlap as John the Apostle may have survived into the second century and Clement of Rome for example lived in the end of the first century.
The earliest recorded use of the term Christianity (Greek: ) is Ignatius of Antioch about 107 A.D.,Walter Bauer, Greek-English Lexicon; Ignatius of Antioch Letter to the Magnesians 10, Letter to the Romans (Roberts-Donaldson tr., Lightfoot tr., Greek text). However, an edition presented on some websites, one that otherwise corresponds exactly with the Roberts-Donaldson translation, renders this passage to the interpolated inauthentic longer recension of Ignatius's letters, which does not contain the word "Christianity." who is also associated with modification of the sabbath, promotion of the bishop, and critique of the Judaizers.
The 2nd century was also the time of several who were later declared to be major heretics, such as Marcion, Valentinius, and Montanus.
==Early Christianity==
====Early Christian worship====
At first, Christians continued to worship alongside Jewish believers, but within twenty years of Jesus's death, Sunday was being regarded as the primary day of worship,Davidson, The Birth of the Church (2005), p. 115 see also Sabbath in Christianity. Growing tensions soon led to a starker separation that was virtually complete by the time Christians refused to join in the Bar Khokba Jewish revolt of 132,Davidson, The Birth of the Church (2005), p. 146 however some groups of Christians retained elements of Jewish practice.Davidson, The Birth of the Church (2005), p. 149 Christianity also differed from other Roman religions in that it set out its beliefs in a clearly defined way.Herring, An Introduction to the History of Christianity (2006), p. 28 The early Christians had no way to own a copy of the works that later became the canon and other church works accepted but not canonized. Much of the original church liturgical services functioned as a means of learning these works, which initially centered around the Septuagint and the Targums, see also Development of the Christian Biblical canon. 
The Christian church was fragmented in its early days.Langan, The Catholic Tradition (1998), p. 55. Langan states that although there were schools in various regions with similar rites and organization, Gnostic, Ebionite and Montanist schools were more loosely structured and often disagreed with each other. Langan, The Catholic Tradition (1998), p. 115 Partially as a response to the Gnostic teaching, in the 2nd century, Irenaeus created the first known document describing apostolic succession.Langan, The Catholic Tradition (1998), p. 107/
The final uniformity of liturgical services became solidified after the church established a Biblical canon, being based on the Apostolic Constitutions and Clementine literature. Clement, wrote about the order with which Jesus commanded the affairs of the Church be conducted. The liturgies are "to be celebrated, and not carelessly nor in disorder."
====Church structure ====
Illegal churches (before "Christian legalization") are mentioned throughout church history. Of the underground churches that existed before legalization, some are recorded to have existed as the catacombs in Europe, Catacombs of Rome, Greece (see Cave of the Apocalypse, The Church of St George and the church at Pergamon) and also in the underground cities of Anatolia such as Derinkuyu Underground City (also see Cave monastery and Bab Kisan).
In the second century, an episcopal structure becomes more visible. Post-apostolic bishops of importance are Polycarp of Smyrna and Irenaeus of Lyons. This structure was enforced by the teaching of apostolic succession where, a bishop becomes the spiritual successor of the previous bishop in a line tracing back to the apostles themselves. Each Christian community also had presbyters, as was the case with Jewish communities, who were also ordained and assisted the bishop; as Christianity spread, especially in rural areas, the presbyters exercised more responsibilities and took distinctive shape as priests. Lastly, deacons also performed certain duties, such as tending to the poor and sick.
Much of the official organizing of the ecclesiastical structure, clarifying true from false teachings was done by the bishops of the church. Their works are referred to as Patristics. This tradition of clarification can be seen as established in the saints of the Orthodox church referred to as the Apostolic Fathers, bishops themselves established by Apostolic succession. This also continued into the age when the practice of the religion of Christianity became legal (see the First seven Ecumenical Councils).
*Pope Victor I (second century)
===Structure and the episcopacy===
In the post-Apostolic church bishops emerged as overseers of urban Christian populations, and a hierarchy clergy gradually took on the form of episkopos (overseers, bishops), elders and presbyters (shepherds), and then deacons (servants). But this emerged slowly and at different times for different locations. Clement, a Bishop of Rome, refers to the leaders of the Corinthian church in his letter Clement I as bishops and presbyters interchangeably, and likewise says that the bishops are to lead God's flock by virtue of the chief shepherd (presbyter), Jesus Christ. The New Testament writers also uses the terms overseer and elders interchangeably. 
Important bishops and letters of the earliest post-Apostolic Era are called Apostolic Fathers, for reportedly knowing and studied under the apostles personally. These include Clement of Rome and Ignatius of Antioch, who, along with Polycarp of Smyrna.
=== The role of the bishop ===
The Didache, dating from A.D. 70 – 140, states "Appoint for yourselves therefore bishops and deacons worthy of the Lord". 
St. Ignatius of Antioch spoke in "praise of unity" in a Letter to the Ephesians, saying "He, therefore, that does not assemble with the Church, has even by this manifested his pride, and condemned himself. For it is written, 'God resisteth the proud.' Let us be careful, then, not to set ourselves in opposition to the bishop, in order that we may be subject to God". Stressing the relationship between the Church initiated by Jesus and the hierarchy set in motion by the apostles, Ignatius writes: "we should look upon the bishop even as we would upon the Lord Himself" (§6). Ignatius stresses the hierarchical relationship between God and the bishop more strongly to the Magnesians urging them "to yield him all reverence, having respect to the power of God the Father, ... submitting to him, or rather not to him, but to the Father of Jesus Christ, the bishop of us all". In §6 he exhorts them to harmony, and in §13 urges them to "[s]tudy ... to be established in the doctrines of the Lord and the apostles, ... with your most admirable bishop...." Thus Ignatius emphasizes unity, obedience, and the hierarchical relationship among the faithful and between the bishop and God. Further elements of the hierarchical relationship are mentioned by St. Clement of Alexandria, referring to advice in the "holy books: some for presbyters, some for bishops and deacons" (Jurgens §413), and writing treatises with titles "On the Unity and Excellence of the Church" and "On the Offices of Bishops, Presbyters, Deacons, and Widows." In his Stromateis, Clement of Alexandria writes that "according to my opinion, the grades here in the Church, of bishops, presbyters, deacons, are imitations of the angelic glory, and of that economy which, the Scriptures say, awaits those who, following the footsteps of the apostles, have lived in perfection of righteousness according to the Gospel".
In the second century (AD 189), the assertion of the primacy of the Church of Rome may be indicated in St. Irenaeus of Lyon's Against Heresies (3:3:2): "With [the Church of Rome], because of its superior origin, all the churches must agree... and it is in her that the faithful everywhere have maintained the apostolic tradition." 
Irenaeus compiled a list of apostolic succession, including the immediate successors of Peter and Paul: Linus, Anacleutus, Clement, Evaristus, Alexander, and Sixtus.Eamon Duffy, Saints and Sinners Chapter One The Catholic Church currently considers these the successors of Peter, whom they consider the first pope, and through whom following popes would claim authority.
===Relationship with bishops of other cities===
Rome, the capital of the Roman Empire, was not the only city that could claim a special role in Christ's Church. Jerusalem had the prestige of being the city of Christ's death and resurrection, "the first Christian church",Catholic Encyclopedia: Jerusalem (A.D. 71-1099): "During the first Christian centuries the church at this place was the centre of Christianity in Jerusalem, "Holy and glorious Sion, mother of all churches" (Intercession in "St. James' Liturgy", ed. Brightman, p. 54). Certainly no spot in Christendom can be more venerable than the place of the Last Supper, which became the first Christian church." and an important church council, the Council of Jerusalem, was held there in the first century. Antioch was the place where Jesus' followers were first called "Christians" {7} (as well as "Catholic") and, with Alexandria, was an important early center of Christian thought. It is important to note, however, that the three main apostolic sees of the 4th century church (i.e. Antioch, Alexandria, and Rome, also known as the Petrine Sees) were directly related to Peter. Prior to holding the position of Bishop of Rome, Peter was the Bishop of Antioch. And his disciple, St. Mark the Evangelist, founded the church in Alexandria. Constantinople became highly important after Constantine moved his capital there in 330 AD.
As early as the second century, the bishop of Rome began to claim his supremacy over all other bishops, and some church fathers also made this claim for him.
===Great Schism Origins===
Leading to the Great Schism, Eastern and Western Mediterranean Christians had a history of differences and disagreements dating back to the second century. Among the most significant disagreements are the Quartodeciman controversy at the time of Victor of Rome (circa 180) 
Some scholarsCleenewerck, Laurent His Broken Body: Understanding and Healing the Schism between the Catholic and Eastern Orthodox Churches. Washington, DC: EUC Press (2008) pp. 145-155 have argued that the Schism between East and West has very ancient roots, and that sporadic schisms in the common unions took place under
==Heresies and the Biblical canon==
The Biblical canon is the set of books Christians regard as divinely inspired and thus constituting the Christian Bible. Though the Early Church used the Old Testament according to the canon of the Septuagint (LXX), the apostles did not otherwise leave a defined set of new scriptures; instead the New Testament developed over time.
The writings attributed to the apostles circulated amongst the earliest Christian communities. The Pauline epistles were circulating in collected form by the end of the first century AD. Justin Martyr, in the early second century, mentions the "memoirs of the apostles", which Christians called "gospels" and which were regarded as on par with the Old Testament.Everett Ferguson, "Factors leading to the Selection and Closure of the New Testament Canon", in The Canon Debate. eds. L. M. McDonald & J. A. Sanders (Hendrickson, 2002) pp. 302–303; cf. Justin Martyr, First Apology 67.3 A four gospel canon (the Tetramorph) was asserted by Ireanaeus, c. 160, who refers to it directly.Everett Ferguson, "Factors leading to the Selection and Closure of the New Testament Canon", in The Canon Debate. eds. L. M. McDonald & J. A. Sanders (Hendrickson, 2002) pp. 301; cf. Irenaeus, Adversus Haereses 3.11.8 
The oldest list of books for the New Testament canon is the Muratorian fragment dating to ca. 170 (see also Chester Beatty Papyri). It shows that by 200 there existed a set of Christian writings somewhat similar to what is now the New Testament, which included the four gospels.H. J. De Jonge, "The New Testament Canon", in The Biblical Canons. eds. de Jonge & J. M. Auwers (Leuven University Press, 2003) p. 315 Thus, while there was a good measure of debate in the Early Church over the New Testament canon, the major writings were accepted by almost all Christians by the middle of the second century.The Cambridge History of the Bible (volume 1) eds. P. R. Ackroyd and C. F. Evans (Cambridge University Press, 1970) p. 308
===Early Heresies===
One of the roles of bishops, and the purpose of many Christian writings, was to refute heresies. The earliest of these were generally Christological in nature, that is, they denied either Christ's (eternal) divinity or humanity. For example, Docetism held that Jesus' humanity was merely an illusion, thus denying the incarnation; whereas Arianism held that Jesus, while not merely mortal, was not eternally divine and was, therefore, of lesser status than God the Father (citing ). Trinitarianism held that God the Father, God the Son, and the Holy Spirit were all strictly one being with three hypostases. Many groups were dualistic, maintaining that reality was composed into two radically opposing parts: matter, usually seen as evil, and spirit, seen as good. Orthodox Christianity, on the other hand, held that both the material and spiritual worlds were created by God and were therefore both good, and that this was represented in the unified divine and human natures of Christ.R. Gerberding and J. H. Moran Cruz, Medieval Worlds (New York: Houghton Mifflin Company, 2004) p. 58
Irenaeus (c. 130–202) was the first to argue that his "proto-orthodox" position was the same faith that Jesus gave to the apostles, and that the identity of the apostles, their successors, and the teachings of the same were all well-known public knowledge. This was therefore an early argument supported by apostolic succession. Irenaeus first established the doctrine of four gospels and no more, with the synoptic gospels interpreted in the light of John. Irenaeus' opponents, however, claimed to have received secret teachings (gnosis) from Jesus via other apostles which were not publicly known. Gnosticism is predicated on the existence of such hidden knowledge, but brief references to private teachings of Jesus have also survived in the canonic Scripture () as did warning by the Christ that there would be false prophets or false teachers. Irenaeus' opponents also claimed that the wellsprings of divine inspiration were not dried up, which is the doctrine of continuing revelation.
In the middle of the 2nd century, three unorthodox groups of Christians adhered to a range of doctrines that divided the Christian communities of Rome: the teacher Marcion, the pentecostal outpourings of ecstatic Christian prophets of a continuing revelation, in a movement that was called "Montanism" because it had been initiated by Montanus and his female disciples, and the gnostic teachings of Valentinus. Early attacks upon alleged heresies formed the matter of Tertullian's Prescription Against Heretics (in 44 chapters, written from Rome), and of Irenaeus' Against Heresies (ca 180, in five volumes), written in Lyons after his return from a visit to Rome. The letters of Ignatius of Antioch and Polycarp of Smyrna to various churches warned against false teachers, and the Epistle of Barnabas accepted by many Christians as part of Scripture in the 2nd century, warned about mixing Judaism with Christianity, as did other writers, leading to decisions reached in the first ecumenical council, which was convoked by the Emperor Constantine at Nicaea in 325, in response to further disruptive polemical controversy within the Christian community, in that case Arian disputes over the nature of the Trinity.
The New Testament itself speaks of the importance of maintaining orthodox doctrine and refuting heresies, showing the antiquity of the concern.e.g., ; ; ; , and the Epistle of James in general. Because of the biblical proscription against false prophets (notably the Gospels of Matthew and Mark) Christianity has always been preoccupied with the "correct", or orthodox, interpretation of the faith. Indeed, one of the main roles of the bishops in the early Church was to determine the correct interpretations and refute contrarian opinions (referred to as heresy). As there were differing opinions among the bishops, defining orthodoxy would consume the Church for some time (and still does, hence, "denominations"). 
In his book Orthodoxy, Christian Apologist and writer G. K. Chesterton asserts that there have been substantial disagreements about faith from the time of the New Testament and Jesus. He pointed out that the Apostles all argued against changing the teachings of Christ as did the earliest church fathers including Ignatius of Antioch, Irenaeus, Justin Martyr and Polycarp (see false prophet, the antichrist, the gnostic Nicolaitanes from the Book of Revelation and Man of Sin). Jesus also refers to false prophets () and the "darnel" (, ) of the flock and how their distortion of the Christian faith is to be rejected.
The development of doctrine, the position of orthodoxy, and the relationship between the various opinions is a matter of continuing academic debate. Since most Christians today subscribe to the doctrines established by the Nicene Creed, modern Christian theologians tend to regard the early debates as a unified orthodox position (see also Proto-orthodox Christianity and Palaeo-orthodoxy) against a minority of heretics. Other scholars, drawing upon, among other things, distinctions between Jewish Christians, Pauline Christians, and other groups such as Gnostics and Marcionites, argue that early Christianity was fragmented, with contemporaneous competing orthodoxies.e.g., ; ; 
==Early writings: Apologetists and Church Fathers==
Church Fathers, Early Church Fathers, or Fathers of the Church are the early and influential theologians and writers in the Christian Church, particularly those of the first five centuries of Christian history. The term is used of writers and teachers of the Church, not necessarily "saints". In the first few centuries of its existence, the Church formed its teachings and traditions into a systematic whole under the influence of theological apologists.Norman, The Roman Catholic Church an Illustrated History (2007), pp. 27–8, quote: "A distinguished succession of theological apologists added intellectual authority to the resources at the disposal of the papacy, at just that point in its early development when the absence of a centralized teaching office could have fractured the universal witness to a single body of ideas. At the end of the first century there was St. Clement of Rome, third successor to St. Peter in the see; in the second century there was St. Ignatius of Antioch, St. Irenaeus of Lyons and St. Justin Martyr; in the fourth century St. Augustine of Hippo, the greatest theologian of the Early Church."
As Christianity spread, it acquired certain members from well-educated circles of the Hellenistic world; they sometimes became bishops but not always. They produced two sorts of works: theological and "apologetic", the latter being works aimed at defending the faith by using reason to refute arguments against the veracity of Christianity. These authors are known as the Church Fathers, and study of them is called Patristics. 
A huge quantity of theological reflection emerged in the early centuries of the Christian church – in a wide variety of genres, in a variety of contexts, and in several languages – much of it the product of attempts to discuss how Christian faith should be lived in cultures very different from the one in which it was born. So, for instance, a good deal of the Greek language literature can be read as an attempt to come to terms with Hellenistic culture. The period sees the slow emergence of orthodoxy (the idea of which seems to emerge from the conflicts between orthodox Christianity and Gnosticism), and the establishment of a Biblical canon.
===Apologetists===
In the face of criticism from Greek philosophers and facing persecution, Apologetists wrote to justify and defend Christian doctrine. Apologetists of this century are Justin Martyr, Tatian, Athenagoras of Athens, Hermias, and Tertullian.
====Justin Martyr====
Justin Martyr (100–165) was an early Christian apologist. His works represent the earliest surviving Christian "apologies" of notable size. Most of what is known about the life of Justin Martyr comes from his own writings. He was born at Flavia Neapolis (ancient Shechem in Judaea/Palaestina, now modern-day Nablus). According to the traditional accounts of the church, Justin suffered martyrdom at Rome under the Emperor Marcus Aurelius when Junius Rusticus was prefect of the city (between 162 and 168).
Justin called himself a Samaritan, but his father and grandfather were probably Greek or Roman, and he was brought up a pagan. It seems that St Justin had property, studied philosophy, converted to Christianity, and devoted the rest of his life to teaching what he considered the true philosophy, still wearing his philosopher's gown to indicate that he had attained the truth. He probably traveled widely and ultimately settled in Rome as a Christian teacher.
Justin had, like others, the idea that the Greek philosophers had derived, if not borrowed, the most essential elements of truth found in their teaching from the Old Testament. Thus he does not scruple to declare that Socrates and Heraclitus were Christians (Apol., i. 46, ii. 10). His aim, of course, is to emphasize the absolute significance of Christ, so that all that ever existed of virtue and truth may be referred to him. The old philosophers and law-givers had only a part of the Logos, while the whole appears in Christ. 
While the gentile peoples, seduced by demons, had deserted the true God for idols, the Jews and Samaritans possessed the revelation given through the prophets and awaited the Messiah. The law, however, while containing commandments intended to promote the true fear of God, had other prescriptions of a purely pedagogic nature, which necessarily ceased when Christ, their end, appeared; of such temporary and merely relative regulations were circumcision, animal sacrifices, the Sabbath, and the laws as to food. Through Christ the abiding law of God has been fully proclaimed. In his character as the teacher of the new doctrine and promulgator of the new law lies the essential nature of his redeeming work. 
Eusebius of Caesarea deals with him at some length,Church History, iv. 18. and names eight works, most now lost, and implies that other works were in circulation. 
*The First Apology of Justin Martyr is addressed to Antoninus Pius, his sons, and the Roman Senate. 
*In the Dialogue with Trypho, after an introductory section, Justin undertakes to show that Christianity is the new law for all men, and to prove from Scripture that Jesus is the Christ. The concluding section (cix.-cxlii.) demonstrates that the Christians are the true people of God.
Justin's self-perception of himself was that of a scholar. Justin was confident that his teaching is that of the Church at large. He knows of a division among the orthodox only on the question of the millennium and on the attitude toward the milder Jewish Christianity, which he personally is willing to tolerate as long as its professors in their turn do not interfere with the liberty of the Gentile converts; his millenarianism seems to have no connection with Judaism, but he believes firmly in a millennium, and generally in the primitive Christian eschatology.
====Tatian====
====Athenagoras====
===Apostolic Fathers===
The earliest Church Fathers, (within two generations of the Apostles of Christ) are usually called the Apostolic Fathers. Important Apostolic Fathers of the second century include Ignatius of Antioch and Polycarp of Smyrna. In addition, the Shepherd of Hermas is usually placed among the writings of the Apostolic Fathers although its authors is unknown.
====Ignatius====
Ignatius of Antioch (also known as Theophorus) (c 35-110)See "Ignatius" in The Westminster Dictionary of Church History, ed. Jerald Brauer (Philadelphia:Westminster, 1971) and also David Hugh Farmer, "Ignatius of Antioch" in The Oxford Dictionary of the Saints (New York:Oxford University Press, 1987). was the third Bishop or Patriarch of Antioch and a student of the Apostle John. En route to his martyrdom in Rome, Ignatius wrote a series of letters which have been preserved as an example of the theology of the earliest Christians. Important topics addressed in these letters include ecclesiology, the sacraments, the role of bishops, and Biblical Sabbath.EPISTLE OF IGNATIUS TO THE MAGNESIANS, chapter IX He is the second after Clement to mention Paul's epistles.Durant, Will. Caesar and Christ. New York: Simon and Schuster. 1972
====Polycarp====
Saint Polycarp of Smyrna (c 69- ca. 155) was a Christian bishop of Smyrna (now İzmir in Turkey). It is recorded that "He had been a disciple of John." The options for this John are John the son of Zebedee traditionally viewed as the author of the Fourth Gospel, or John the Presbyter (Lake 1912). Traditional advocates follow Eusebius in insisting that the apostolic connection of Papius was with John the Evangelist, and that this John, the author of the Gospel of John, was the same as the Apostle John. Polycarp, c 156, tried and failed to persuade Anicetus, Bishop of Rome, to have the West celebrate Easter on 14 Nisan, as in the East. He rejected the Pope's suggestion that the East use the Western date. In 155, the Smyrnans demanded Polycarp's execution as a Christian, and he died a martyr. His story has it that the flames built to kill him refused to burn him, and that when he was stabbed to death, so much blood issued from his body that it quenched the flames around him. Polycarp is recognized as a saint in both the Roman Catholic and Eastern Orthodox churches.
====The Shepherd of Hermas====
The Shepherd of Hermas (second century) was popular in the early church, considered a valuable book by many Christians, and considered canonical scripture by some of the early Church fathers, possibly Irenaeus.McDonald & Sanders, The Canon Debate, Appendix D-1, lists the following canon for Irenaeus, based on Eusebius' Church History 5.8.2-8, but notes that: "..it is probably nothing more than Eusebius's listing of the references made by Irenaeus.": "Matt, Mark, Luke, John, Rev, 1 John, 1 Peter, Hermas, Wisdom, Paul (mentioned but epistles not listed)" It was written at Rome, in Greek. The Shepherd had great authority in the second and third centuries."The Pastor of Hermas was one of the most popular books, if not the most popular book, in the Christian Church during the second, third and fourth centuries. It occupied a position analogous in some respects to Bunyan's Pilgrim's Progress in modern times." (F. Crombie, translator of Schaff, op. cit.). It was cited as Scripture by Irenaeus and Tertullian and was bound with the New Testament in the Codex Sinaiticus, and it was listed between the Acts of the Apostles and the Acts of Paul in the stichometrical list of the Codex Claromontanus. Other early Christians, however, considered the work to be apocryphal.See Muratorian fragment, below.
While originally written in the Greek language, a Latin translation was made very shortly afterwards. Some say this was done by the original author as a sign of the authenticity of the translation, though others dispute this. Only the Latin version has been preserved in full; of the Greek, the last fifth or so is missing. The work comprises five visions, twelve mandates, and ten parables. It relies on allegory and pays special attention to the Church, calling the faithful to repent of the sins that have harmed it.
The visions were granted to Hermas, a former slave. This is followed by twelve mandates or commandments, and ten similitudes, or parables. It commences abruptly in the first person. "He who brought me up sold me to a certain Rhoda, who was at Rome. After many years I met her again, and began to love her as a sister." As Hermas was on the road to Cumae, he had a vision of Rhoda, who was presumably dead. Allegorical language is used through the early parts of the work. In the second vision she gives Hermas a book, which she afterwards takes back in order to add to it. The fifth vision, which is represented as taking place twenty days after the fourth, introduces "the Angel of repentance" in the guise of a shepherd, from whom the whole work takes its name. He delivers to Hermas a series of precepts (mandata, entolai), which form an interesting development of early Christian ethics. One point which deserves special mention is the assertion of a husband's obligation to take back an adulterous wife on her repentance. The eleventh mandate, on humility, is concerned with false prophets who desire to occupy the first seats (that is to say, among the presbyters). Some have seen here a reference to Marcion, who came to Rome c.140 and desired to be admitted among the priests or possibly even to become bishop of Rome. After the mandates come ten similitudes (parabolai) in the form of visions, which are explained by the angel. In Similitude 9 it is said that all the baptized are holy, though they may be cast out for grave sins, and can be readmitted only (once) after penance.
===Greek Fathers===
Those who wrote in Greek are called the Greek Church Fathers. Famous Greek Fathers of second century (other than the Apostolic Fathers, above) include: Irenaeus of Lyons and Clement of Alexandria.
====Irenaeus====
Irenaeus of Lyons, (b. second century; d. end of second or beginning of third century) was bishop of Lugdunum in Gaul, which is now Lyons, France. His writings were formative in the early development of Christian theology, and he is recognized as a saint by both the Eastern Orthodox Church and the Roman Catholic Church. He was a notable early Christian apologist. He was also a disciple of Polycarp, who was said to be a disciple of John the Evangelist. 
His best-known book, Against Heresies (c. 180) enumerated heresies and attacked them. Irenaeus wrote that the only way for Christians to retain unity was to humbly accept one doctrinal authority—episcopal councils. Irenaeus was the first to propose that all four gospels be accepted as canonical.
====Clement====
Clement of Alexandria (c.150 - 215), was a Christian theologian and the head of the noted Catechetical School of Alexandria. Clement is best remembered as the teacher of Origen. He united Greek philosophical traditions with Christian doctrine and valued gnosis that with communion for all people could be held by common Christians specially chosen by God. He used the term "gnostic" for Christians who had attained the deeper teaching of the Logos."Clement of Alexandria." Cross, F. L., ed. The Oxford dictionary of the Christian church. New York: Oxford University Press. 2005 He developed a Christian Platonism.Durant, Will. Caesar and Christ. New York: Simon and Schuster. 1972 He presented the goal of Christian life as deification, identified both as Platonism's assimilation into God and the biblical imitation of God.
Clement's parents seem to have been wealthy pagans of some social standing. The thoroughness of his education is shown by his constant quotation of the Greek poets and philosophers. He travelled in Greece, Italy, Palestine, and finally Egypt. He became the colleague of Pantaenus, the head of the Catechetical School of Alexandria, and finally succeeded him in the direction of the school. One of his most popular pupils was Origen. Alexandria had a major Christian community in early Christianity, noted for its scholarship and its high-quality copies of Scripture known as the Alexandrian text-type. During the persecution of Christians by Septimius Severus (202 or 203) he sought refuge with Alexander, then Cappadocia. 
The trilogy into which Clement's principal remains are connected by their purpose and mode of treatment is composed of: 
:*Protrepticus, "Exhortation to the Greeks"
:*Paedagogus, "Instructor"
:*Stromata, "Miscellanies"
The first book deals with the religious basis of Christian morality, the second and third with the individual cases of conduct. As with Epictetus, true virtue shows itself with him in its external evidences by a natural, simple, and moderate way of living. Besides the great trilogy, the only complete work preserved is the treatise "Who is the Rich Man that Shall Be Saved?" based on Mark , and laying down the principle that not the possession of riches but their misuse is to be condemned. 
The significance of Clement in the history of the development of doctrine is, according to Adolf von Harnack, that he knew how to replace the apologetic method by the constructive or systematic, to turn the simple church tradition into a "scientific" dogmatic theology. It is a marked characteristic of his that he sees only superficial and transient disagreement where others find a fundamental opposition. He is able to reconcile, or even to fuse, differing views to an extent which makes it almost impossible to attribute to him a definite individual system. He is admittedly an eclectic (Stromata, i. 37). This attitude determines especially his treatment of non-Christian philosophy.
===Latin Fathers===
Church Fathers who wrote in Latin are called the Latin Church Fathers. Tertullian was the first Latin Father and only well known such Father of the second century.
====Tertullian====
Tertullian (c. 160 - c 225), who was converted to Christianity before 197, was a prolific writer of apologetic, theological, controversial and ascetic works.Cross, F. L., ed. The Oxford Dictionary of the Christian Church. New York: Oxford University Press. 2005, article Tertullian He was the son of a Roman centurion.
Tertullian denounced Christian doctrines he considered heretical, but later in life adopted views that themselves came to be regarded as heretical. He wrote three books in Greek and was the first great writer of Latin Christianity, thus sometimes known as the "Father of the Latin Church". Vincent of Lerins in 434AD, Commonitorium, 17, describes Tertullian as 'first of us among the Latins' (Quasten IV, p.549) He was evidently a lawyer in Rome.Catholic Encyclopedia: Tertullian: "He was evidently by profession an advocate in the law-courts, and he shows a close acquaintance with the procedure and terms of Roman law, though it is doubtful whether he is to be identified with a jurist Tertullian who is cited in the Pandects." He is said to have introduced the Latin term "trinitas" with regard to the Divine (Trinity) to the Christian vocabularyA History of Christian Thought, Paul Tillich, Touchstone Books, 1972. ISBN 0-671-21426-8 (p. 43) (but Theophilus of Antioch (c. 115 - c. 183) already wrote of "the Trinity, of God, and His Word, and His wisdom", which is similar but not identical to the Trinitarian wording),To Autolycus, Book 2, chapter XV and also probably the formula "three Persons, one Substance" as the Latin "tres Personae, una Substantia" (itself from the Koine Greek "treis Hypostases, Homoousios"), and also the terms "vetus testamentum" (Old Testament) and "novum testamentum" (New Testament). 
In his Apologeticus, he was the first Latin author who qualified Christianity as the "vera religio", and systematically relegated the classical Roman Empire religion and other accepted cults to the position of mere "superstitions".
Later in life, Tertullian is thought by some to have joined the Montanists, a heretical and rigorous sect.
==Spread of Christianity==
===Church of Antioch===
The community and seat of the patriarchate according to Orthodox tradition was founded by St Peter and the given to St. Ignatius, in what is now Turkey. 
===Origin and Expansion of the Church of the East===
Strangely, the church which spread throughout most of Asia bears the appellation “Nestorian,” after the fifth century patriarch of Constantinople, Nestorius, who was condemned by Rome as a heretic in A.D. 430. The name is actually a misnomer which became current in the West; the Roman See had sought to discredit this church, which had renounced Rome's primacy for geographical, political, linguistic, and doctrinal reasons. Nestorian was not the name by which the church knew itself., nor was it so commonly designated in Asian lands. It was rather known as the Church of the East, or Easterns, to distinguish it from the Greek and Latin churches in the West which were divided by subtle theological controversies little appreciated by the Eastern Christians. It also came to be known as the Assyrian church because of the location of its successive headquarters, and also as the Luminous Religion, especially in China.
This ancient church claimed a first-century origin and developed almost wholly apart from the Greek and Roman churches, using the Aramaic language. It did not embrace the heresy of which Nestorius was accused, though it endorsed his opposition to the Roman doctrines of purgatory and Mariolatry, especially her title as “Mother of God” and or Theotokos. For at least twelve hundred years the church of the Easterns was noted for its missionary zeal, its high degree of lay participation, its superior educational standards and cultural contributions in less developed countries, and its fortitude in the face of persecution.
===Parthian and Persian Empires===
The Church of the East had its inception at a very early date in the buffer zone between the Parthian and Roman Empires in Upper Mesopotamia, known as the Assyrian Church of the East. The vicissitudes of its later growth were rooted in its minority status in a situation of international tension. The rulers of the Parthian Empire (250 BC - AD 226) were on the whole tolerant in spirit, and with the older faiths of Babylonia and Assyria in a state of decay, the time was ripe for a new and vital faith. The rulers of the Second Persian empire (226-640) also followed a policy of religious toleration to begin with, though later they gave Christians the same status as a subject race. However, these rulers also encouraged the revival of the ancient Persian dualistic faith of Zoroastrianism and established it as the state religion, with the result that the Christians were increasingly subjected to repressive measures. Nevertheless, it was not until Christianity became the state religion in the West (380) that enmity toward Rome was focused on the Eastern Christians. After the Mohammedan conquest in the seventh century, the caliphate tolerated other faiths but forbade proselytism and subjected Christians to heavy taxation.
Edessa (now Şanlıurfa) in northwestern Mesopotamia was from apostolic times the principal center of Syriac-speaking Christianity. it was the capital of an independent kingdom from 132 BC to A.D. 216, when it became tributary to Rome. Celebrated as an important centre of Greco-Syrian culture, Edessa was also noted for its Jewish community., with proselytes in the royal family. Strategically located on the main trade routes of the Fertile Crescent, it was easily accessible from Antioch, where the mission to the Gentiles was inaugurated. When early Christians were scattered abroad because of persecution, some found refuge at Edessa. Thus the Edessan church traced its origin to the apostolic age (which may account for its rapid growth), and Christianity even became the state religion for a time.
An ancient legend recorded by Eusebius (A.D. 260-340) and also found in the Doctrine of Addai (c. A.D. 400) (from information in the royal archives of Edessa) describes how King Abgar V of Edessa communicated with Jesus, requesting Him to come and heal him, to which appeal he received a reply. After the resurrection, the Apostle Thomas sent one of the seventy (Luke 10:1), Addai or Thaddaeus, to preach the gospel and heal the king, with the result that the city was won to the Christian faith. In this mission he was accompanied by a disciple, Mari, and the two are regarded as cofounders of the church, according to the Liturgy of Addai and Mari (c. A.D. 200), which is still the normal liturgy of the Assyrian church. The Doctrine of Addai further states that Thomas was regarded as an apostle of the church, which long treasured a letter written by him from India.
Thus it was from Edessa that a missionary movement began which gradually spread throughout Mesopotamia, Persia, Central Asia and China. According to another ancient tradition, Mari was sent as a missionary to Seleucia (on the Tigris River near Baghdad), which, with its twin city of Ctesiphon across the river, became another canter of missionary outreach. Mari was also regarded as the pioneer evangelist in the whole region of Adiabene to the north, of which Arbil (now Erbil) was the capital. By the latter half of the second century, Christianity had spread east throughout Media, Persia, Parthia, and Bactria. The twenty bishops and many presbyters were more of the order of itinerant missionaries, passing from place to place as Paul did and supplying their needs with such occupations as merchant or craftsman. By A.D. 280 the metropolis of Seleucia assumed the title of “Catholicos,”and in A.D. 424 a council of the church at Seleucia elected the first patriarch to have jurisdiction over the whole church of the East, including India and Ceylon (Sri Lanka). The seat of the Patriarchate was fixed at Seleucia-Ctesiphon, since this was an important point on the East-West trade routes which extended both to India and China, Java and Japan. Thus the shift of ecclesiastical authority was away from Edessa, which in A.D. 216 had become tributary to Rome. the establishment of an independent patriarchate with nine subordinate metropoli contributed to a more favourable attitude by the Persian government, which no longer had to fear an ecclesiastical alliance with the common enemy, Rome.
===Arabian Peninsula===
In our consideration of the penetration of the Arabian peninsula by the gospel, it is necessary to distinguish between the marauding Bedouin nomads of the interior, who were chiefly herdsmen and unreceptive to foreign influence, and the inhabitants of the settled communities of the coastal areas and oases, who were either middlemen traders or farmers and were receptive to influences from abroad. Christianity apparently gained its strongest foothold in the ancient center of Semitic civilisation in South-west Arabia or Yemen, (sometimes known as Seba or Sheba), whose queen visited Solomon. Because of geographic proximity, acculturation with Ethiopia was always strong, and the royal family traces its ancestry to this queen.
The presence of Arabians at Pentecost and Paul's three-year sojourn in Arabia suggest a very early gospel witness. A fourth-century church history, states that the apostle Bartholomew preached in Arabia and that Himyarites were among his converts. Arabia's close relations with Ethiopia give significance to the conversion of the treasurer to the queen of Ethiopia, not to mention the tradition that the Apostle Matthew was assigned to this land. Eusebius says that “one Pantaneous (c. A.D. 190) was sent from Alexandria as a missionary to the nations of the East,,”including southwest Arabia, on his way to India.
== References ==
== Further reading ==
* Berard, Wayne Daniel. When Christians Were Jews (That Is, Now). Cowley Publications (2006). ISBN 1561012807.
* Bockmuehl, Markus N.A. The Cambridge Companion to Jesus. Cambridge University Press (2001). ISBN 0521796784.
* Brown, Schuyler. The Origins of Christianity: A Historical Introduction to the New Testament. Oxford University Press (1993). ISBN 0198262078.
* Dunn, James D.G. Jews and Christians: The Parting of the Ways, A.D. 70 to 135. Wm. B. Eerdmans Publishing (1999). ISBN 0802844987.
* Dunn, James D.G. The Cambridge Companion to St. Paul. Cambridge University Press (2003). ISBN 0521786940.
* Elwell, Walter A. & Comfort, Philip Wesley. Tyndale Bible Dictionary. Tyndale House Publishers (2001). ISBN 0842370897.
* Esler, Phillip F. The Early Christian World. Routledge (2004). ISBN 0415333121.
* Tabor, James D. "Ancient Judaism: Nazarenes and Ebionites", The Jewish Roman World of Jesus. Department of Religious Studies at the University of North Carolina at Charlotte (1998).
* White, L. Michael. From Jesus to Christianity. HarperCollins (2004). ISBN 0060526556.
* Wright, N.T. The New Testament and the People of God. Fortress Press (1992). ISBN 0800626818.
* Wylen, Stephen M. The Jews in the Time of Jesus: An Introduction. Paulist Press (1995). ISBN 0809136104.
* Dunn, James D.G. Unity and Diversity in the New Testament: An Inquiry into the Character of Earliest Christianity. SCM Press (2006). ISBN 0334029988.
* Freedman, David Noel (Ed). Eerdmans Dictionary of the Bible. Wm. B. Eerdmans Publishing (2000). ISBN 0802824005.
* Keck, Leander E. Paul and His Letters. Fortress Press (1988). ISBN 0800623401.
* Mills, Watson E. Acts and Pauline Writings. Mercer University Press (1997). ISBN 086554512X.
* Pelikan, Jaroslav Jan. The Christian Tradition: The Emergence of the Catholic Tradition (100-600). University of Chicago Press (1975). ISBN 0226653714.
* Thiede, Carsten Peter. The Dead Sea Scrolls and the Jewish Origins of Christianity. Palgrabe Macmillan (2003). ISBN 1403961433.
==External links==
*Internet Ancient History Sourcebook: Christian Origins
*Guide to Early Church Documents
*Chart of Church Fathers at ReligionFacts.com
*Church Fathers' works in English edited by Philip Schaff, at the Christian Classics Ethereal Library
*Church Fathers at Newadvent.org
*Faulkner University Patristics Project A growing collection of English translations of patristic texts and high-resolution scans from the comprehensive Patrologia compiled by J. P. Migne.
*Primer on the Church Fathers at Corunum
*New Schaff-Herzog Encyclopedia of Religious Knowledge 
*Catholic Encyclopedia: St. Justin Martyr
*EarlyChurch.org.uk
==See also==
*List of events in early Christianity
*History of Christianity
*History of the Roman Catholic Church
*History of the Eastern Orthodox Church
*History of Christian theology
*Christian martyrs
*History of Oriental Orthodoxy
*History of early Christianity
*Ante-Nicene Period
*Church Fathers
*List of Church Fathers
*Patristics
*Persecution of Christians in the New Testament
*Hellenistic Judaism
*List of events in early Christianity
*Development of the New Testament canon
*Christianization
*History of Calvinist-Arminian debate
*Timeline of Christianity#Early Christianity
*Timeline of Christian missions#Early Christianity
*Timeline of the Roman Catholic Church#Up to 312 AD
*2nd-century
*Chronological list of saints in the 2nd century
History of Christianity: Early Christianity	History of Christianity: Early Christianity	History of Christianity: Early Christianity	History of Christianity: Early Christianity	History of Christianity: Early Christianity	History of Christianity: Early Christianity	History of Christianity: Early Christianity	History of Christianity: Early Christianity	History of Christianity: Early Christianity	History of Christianity: Early Christianity	History of Christianity: Early Christianity
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Category:2nd century in religion
Category:2nd century
Category:Early Christianity and Judaism