Question: Cirta was repopulated by Romans by the founder of what Roman empire?

Context paragraphs:
Constitution of the Late Roman Empire: The constitution of the late Roman Empire was an unwritten set of guidelines and principles passed down, mainly through precedent, which defined the manner in which the late Roman Empire was governed.  As a matter of historical convention, the late Roman Empire emerged from the Roman Principate (the early Roman Empire), with the accession of Diocletian in AD 284, his reign marking the beginning of the Dominate.  The constitution of the Dominate ultimately recognized monarchy as the true source of power, and thus ended the fiction of dyarchy, in which emperor and Senate governed the empire together.

Augustus: Augustus (Latin: "Imperātor Caesar Dīvī Fīlius Augustus" ; 23 September 63 BC – 19 August 14 AD) was the founder of the Roman Principate and considered the first Roman emperor, controlling the Roman Empire from 27 BC until his death in AD 14.  He was born Gaius Octavius into an old and wealthy equestrian branch of the plebeian "gens" Octavia.  His maternal great-uncle Julius Caesar was assassinated in 44 BC, and Octavius was named in Caesar's will as his adopted son and heir, then known as Octavianus (Anglicized as Octavian).  He, Mark Antony, and Marcus Lepidus formed the Second Triumvirate to defeat the assassins of Caesar.  Following their victory at the Battle of Philippi, the Triumvirate divided the Roman Republic among themselves and ruled as military dictators.  The Triumvirate was eventually torn apart by the competing ambitions of its members.  Lepidus was driven into exile and stripped of his position, and Antony committed suicide following his defeat at the Battle of Actium by Octavian in 31 BC.

Roman Cyprus: Roman Cyprus was a key spot for important political and religious functions.  It was also a strategic base for trade in the Mediterranean.  Consistently occupied throughout history, Cyprus has been home to several strong and competing powers such as the Assyrians, Egyptians, Macedonians, and in particular the Romans.  Cyprus was annexed by the Romans in 58 B.C., but until 22 B.C. when Cyprus became an official senatorial province, control over the island fluctuated between the Romans and the Ptolemaic Empire.  Yet, from the Battle of Actium in 31 B.C. to the Byzantine Empire in the 4th century, Cyprus was controlled by the Romans.  And in 293 AD, Cyprus officially became part of the Eastern Roman Empire.

History of the Byzantine Empire: This history of the Byzantine Empire covers the history of the Eastern Roman Empire from late antiquity until the Fall of Constantinople in 1453 AD.  Several events from the 4th to 6th centuries mark the transitional period during which the Roman Empire's east and west divided.  In 285, the emperor Diocletian (r. 284–305) partitioned the Roman Empire's administration into eastern and western halves.  Between 324 and 330, Constantine I (r. 306–337) transferred the main capital from Rome to Byzantium, later known as "Constantinople" ("City of Constantine") and "Nova Roma" ("New Rome").  Under Theodosius I (r. 379–395), Christianity became the Empire's official state religion and others such as Roman polytheism were proscribed.  And finally, under the reign of Heraclius (r. 610–641), the Empire's military and administration were restructured and adopted Greek for official use instead of Latin.  Thus, although it continued the Roman state and maintained Roman state traditions, modern historians distinguish Byzantium from ancient Rome insofar as it was oriented towards Greek rather than Latin culture, and characterised by Orthodox Christianity rather than Roman polytheism.

Second Council of Cirta: The Second Council of Cirta was a conference of Bishops, held in June 412, at Cirta in Roman North Africa, and was debated between the Catholic lead by Augustine and the Donatists lead by Silvanus of Numidia.  It is notable as the origin of the Catholic Dogma claim that "There is no salvation outside the Catholic Church".

Roman military frontiers and fortifications: Roman military borders and fortifications were part of a grand strategy of territorial defense in the Roman Empire, although this is a matter of debate.  By the early 2nd century, the Roman Empire had reached the peak of its territorial expansion and rather than constantly expanding their borders as earlier in the Empire and Republic, the Romans solidified their position by fortifying their strategic position with a series of fortifications and established lines of defense.  Historian Adrian Goldsworthy argues that the Romans had reached the natural limits which their military traditions afforded them conquest over and that beyond the borders of the early-to-mid Empire lay peoples whose military traditions made them militarily unconquerable, despite many Roman battle victories.  In particular, Goldsworthy argues that the cavalry-based warfare of the Parthians, Sarmatians and Persians presented a major challenge to the expansion of Rome's infantry-based armies.

Visigoths: The Visigoths ( ; ; Latin: "Visigothi", "Wisigothi", "Vesi", "Visi", "Wesi", or "Wisi" ; Italian: "Visigoti" ) were the western branches of the nomadic tribes of Germanic peoples referred to collectively as the Goths.  These tribes flourished and spread throughout the late Roman Empire in Late Antiquity, or what is known as the Migration Period.  The Visigoths emerged from earlier Gothic groups (possibly the Thervingi) who had invaded the Roman Empire beginning in 376 and had defeated the Romans at the Battle of Adrianople in 378.  Relations between the Romans and the Visigoths were variable, alternately warring with one another and making treaties when convenient.  The Visigoths invaded Italy under Alaric I and sacked Rome in 410.  After the Visigoths sacked Rome, they began settling down, first in southern Gaul and eventually in Spain and Portugal, where they founded the Visigothic Kingdom and maintained a presence from the 5th to the 8th centuries AD.

Cirta: Cirta (from Berber: KRTN or Kirthan, Phoenician: "Tzirta" ) was the capital city of the Berber Kingdom of Numidia in northern Africa (modern Algeria).  Its strategically important port city was Russicada.  Although Numidia was a key ally of the ancient Roman Republic during the Punic Wars (264–146 BC), Cirta was subject to Roman invasions during the 1st and 2nd centuries BC.  Eventually it went under Roman dominion during the rule of Julius Caesar.  Cirta was then repopulated by Roman colonists by Caesar and Augustus and was surrounded by a "Confederation of free Roman cities" (Tiddis, Cuicul, Milevum, etc.) The city was destroyed in the beginning of the 4th century and was rebuilt by the Roman emperor Constantine the Great, who gave his name to the newly constructed city, Constantine.  Vandals damaged Cirta, but emperor Justinianus I reconquered and improved the Roman city.  Arabs finally captured it in 698 AD.

Byzantine Empire: The Byzantine Empire, also referred to as the Eastern Roman Empire, was the continuation of the Roman Empire in the East during Late Antiquity and the Middle Ages, when its capital city was Constantinople (modern-day Istanbul, which had been founded as Byzantium).  It survived the fragmentation and fall of the Western Roman Empire in the 5th century AD and continued to exist for an additional thousand years until it fell to the Ottoman Turks in 1453.  During most of its existence, the empire was the most powerful economic, cultural, and military force in Europe.  Both "Byzantine Empire" and "Eastern Roman Empire" are historiographical terms created after the end of the realm; its citizens continued to refer to their empire as the "Roman Empire" (Greek: Βασιλεία τῶν Ῥωμαίων , tr.  "Basileia tôn Rhōmaiōn" ; Latin: "Imperium Romanum" ), or "Romania" (Ῥωμανία ), and to themselves as "Romans".

Western Roman Empire: In historiography, the Western Roman Empire consists of the western provinces of the Roman Empire at any one time during which they were administered by a separate independent Imperial court, coequal with (or only nominally subordinate to) that administering the eastern half.  Both "Western Roman Empire" and "Eastern Roman Empire" (or "Byzantine Empire") are modern terms describing "de facto" independent entities; however, at no point did the Romans consider the Empire split into two, but rather considered it a single state governed by two separate Imperial courts out of administrative expediency.  The view that the Empire was impossible to govern by one emperor was established by Diocletian following the disastrous civil wars and disintegration of the Crisis of the 3rd century, and was instituted in Roman law by his introduction of the Tetrarchy in AD 285, a form of government which was legally to endure in one form or another for centuries.  The Western Court was periodically abolished and recreated for the next two centuries until final abolition by Zeno in 480, by which time there was little effective central control left in the area legally administered by the Western Court.

Supporting paragraphs: Cirta Augustus
Answer: Principate