Roman emperor Theodosius II publishes the law codex Codex Theodosianus

In modern historiography, ancient Rome is the Roman civilisation from the founding of the Italian city of Rome in the 8th century BC to the collapse of the Western Roman Empire in the 5th century AD. It encompasses the Roman Kingdom (753–509 BC), the Roman Republic (509‍–‍27 BC), and the Roman Empire until the fall of the western empire.

Theodosius II, called "the Calligrapher", was Roman emperor from 402 to 450. He was proclaimed Augustus as an infant and ruled as the Eastern Empire's sole emperor after the death of his father Arcadius in 408. His reign was marked by the promulgation of the Theodosian law code and the construction of the Theodosian walls of Constantinople. He also presided over the outbreak of two great Christological controversies, Nestorianism and Eutychianism.

The Codex Theodosianus is a compilation of the laws of the Roman Empire under the Christian emperors since 312. A commission was established by Emperor Theodosius II and his co-emperor Valentinian III on 26 March 429 and the compilation was published by a constitution of 15 February 438. It went into force in the eastern and western parts of the empire on 1 January 439. The original text of the codex is also found in the Breviary of Alaric, promulgated on 2 February 506 by Visigoth King Alaric II.

February 15 is the 46th day of the year in the Gregorian calendar; 319 days remain until the end of the year.