Question: Which Roman emperor was regarded as the third of the Five Good Emperors but is know for killing Saint Thamel?

full_context: Document 1: Trajan: Trajan ( ; Latin: "Imperator Caesar Nerva Traianus Divi Nervae filius Augustus" ; 18 September 538August 117 AD) was Roman emperor from 98 to 117AD. Officially declared by the Senate "optimus princeps" ("the best ruler"), Trajan is remembered as a successful soldier-emperor who presided over the greatest military expansion in Roman history, leading the empire to attain its maximum territorial extent by the time of his death. He is also known for his philanthropic rule, overseeing extensive public building programs and implementing social welfare policies, which earned him his enduring reputation as the second of the Five Good Emperors who presided over an era of peace and prosperity in the Mediterranean world.
Document 2: Pantheon, Rome: The Pantheon ( or ; Latin: "Pantheon" , from Greek "Πάνθειον Pantheion" meaning "[temple] of every god") is a former Roman temple, now a church, in Rome, Italy, on the site of an earlier temple commissioned by Marcus Agrippa during the reign of Augustus (27 BC – 14 AD). The present building was completed by the emperor Hadrian and probably dedicated about 126 AD. He retained Agrippa's original inscription, which has confused its date of construction as the original Pantheon burnt down so it is not certain when the present one was built.
Document 3: Amphibalus: Saint Amphibalus is a venerated early Christian priest said to have converted Saint Alban to Christianity. He occupied a place in British hagiography almost as revered as Saint Alban himself. According to many hagiographical accounts, including those of Gildas, Bede, Geoffrey of Monmouth, and Matthew of Paris, Amphibalus was a Roman Christian fleeing religious persecution under Emperor Diocletian. Saint Amphibalus was offered shelter by Saint Alban in the Roman city of Verulamium, in modern-day England. Saint Alban was so impressed with the priest's faith and teaching that he began to emulate him in worship, and eventually became a Christian himself. When Roman soldiers came to seize St. Amphibalus, Alban put on Amphibalus' robes and was punished in his place. According to Matthew Paris, after St. Alban's martyrdom, the Romans eventually caught and martyred Amphibalus as well.
Document 4: Marcus Aurelius: Marcus Aurelius ( ; Latin: "Marcus Aurelius Antoninus Augustus" ; 26 April 121 – 17 March 180 AD) was Roman emperor from , ruling jointly with Lucius Verus until Verus' death in 169 and jointly with his son, Commodus, from 177. He was the last of the so-called Five Good Emperors.
Document 5: Antoninus Pius: Antoninus Pius (Latin: "Titus Aelius Hadrianus Antoninus Augustus Pius" ; 19 September 867 March 161), also known as Antoninus, was Roman emperor from 138 to 161. He was one of the Five Good Emperors in the Nerva–Antonine dynasty and the Aurelii.
Document 6: Stephen: Stephen or Steven is a common English first name. It is particularly significant to Christians, as it belonged to Saint Stephen (Greek Στέφανος "Stéphanos"), an early disciple and deacon who, according to the Book of Acts, was stoned to death; he is widely regarded as the first martyr (or "protomartyr") of the Christian Church. The name "Stephen" (and its more common variant "Steven") is derived from Greek Στέφανος ("Stéphanos"), a first name from the Greek word στέφανος ("stéphanos"), meaning "wreath, crown" and by extension "reward, honor", from the verb στέφειν ("stéphein"), "to encircle, to wreathe". In Ancient Greece, crowning wreaths (such as laurel wreaths) were given to the winners of contests. Originally, as the verb suggests, the noun had a more general meaning of any "circle"—including a circle of people, a circling wall around a city, and, in its earliest recorded use, the circle of a fight, which is found in the Iliad of Homer.
Document 7: Hadrian: Hadrian ( ; Latin: "Publius Aelius Hadrianus Augustus" ; 24 January 76 – 10 July 138) was Roman emperor from 117 to 138. He is known for building Hadrian's Wall, which marked the northern limit of Britannia. He also rebuilt the Pantheon and constructed the Temple of Venus and Roma. Philhellene in most of his tastes, he is considered by some to have been a humanist, and he is regarded as the third of the Five Good Emperors.
Document 8: Wall of Severus: The Wall of Severus was possibly a defensive fortification built by the Roman Emperor Septimius Severus (reigned AD 193–211) in Britannia during the emperor's campaign there. Three texts mention the wall:
Document 9: Augurius of Tarragona: Augurius of Tarragona or Saint Augurius  (died 259) was a Christian Hispano-Roman clergyman. It is also cited as Augurinus. Exerting the office of deacon was martyred along with bishop Fructuosus and deacon Eulogius. He died burned alive in the amphitheater of Tarraco during the persecution decreed by the Roman emperors Valerian and Galerius. Possibly were the first martyrs of which there is some sort of documentation in the history of Christianity in Spain.
Document 10: Publius Aelius Hadrianus Afer: Publius Aelius Hadrianus Afer was a distinct and wealthy Roman Senator and soldier who lived in the Roman Empire during the 1st century. Hadrianus Afer was originally from Spain; however, he was of Roman descent. He was born and raised in the grand city of Italica (near modern Seville, Spain) in the Roman Province of Hispania Baetica. He came from a well-established, wealthy and aristocratic family of Praetorian rank. He was the son of the noble Roman woman called Ulpia and his father was a Roman Senator called Publius Aelius Hadrianus Marullinus. Hadrianus Afer’s maternal uncle was the Roman General and Senator Marcus Ulpius Traianus, the father of Ulpia Marciana and her younger brother Emperor Trajan. Ulpia Marciana and Trajan were his maternal cousins.
Document 11: Agathangelus of Rome: Saint Agathangelus of Rome (died 312), was a Roman deacon and disciple of Clement of Ancyra, was a martyr during the reign of emperor Diocletian. He met Clement when the latter was imprisoned in Rome, and traveled back to Ancyra with him where they were both beheaded. According to the Gregorian calendar, his and Clement's feast day is on January 23 but on February 5 according to the Julian calendar which is used in some Eastern Orthodox countries.
Document 12: Sanesan: Sanesan was the king of Maskut in the early 4th century. He converted to Christianity, but then rejected it and slew Grigoris, the bishop who had introduced him to the faith. According to Faustus Byuzand, when Grigoris arrived in the Caucasian Albanian principality of Maskut (located along the northeastern Azerbaijani and south Dagestani shore of the Caspian Sea) to preach Christianity, its ruler Sanatruk (also known as Sanesan) of the local branch of Arsacides ordered him killed. Grigoris was trampled to death by mounted Maskut soldiers in the Vatnik Valley, near the present-day village of Nughdi 37 south of Derbent.
Document 13: Thamel (martyr): Saint Thamel and companions (died 125 AD) are a group of 2nd century Christian martyrs. Thamel was a priest for a pagan god who was converted to Christianity. He was killed with his sister during the persecutions of Christians under the Roman emperor Hadrian.
Document 14: 1221: (The Jews were falsely accused of a ritual murder. A crowd stormed the synagogue where the Jews had gathered. As usual the threat was baptism or death. The Jewish quarter including the synagogue was razed, many Jews were tortured and killed. Among the martyrs were Shem Tov ha-Levi, and Rabbi and Mrs. Shmuel Kalonymos, Hy'd.)
Document 15: Crescentius of Rome: Saint Crescentius of Rome (Italian: "San Crescenzio di Roma" ) is venerated as a child martyr by the Roman Catholic Church. According to tradition, he was born of a noble Roman family and was baptized along with his parents by Saint Epigmenius. During the persecutions of Christians by Diocletian, the family fled to Perugia, where his father Saint Euthymius died. Led back to Rome, Crescentius, who was eleven years old, was beheaded on the via Salaria, outside of the city walls.
ground_truth: Hadrian