420s

Millennium:	1st millennium
Centuries:	4th century – 5th century – 6th century
Decades:	390s 400s 410s – 420s – 430s 440s 450s
Years:	420 421 422 423 424 425 426 427 428 429
Categories:	Births – Deaths – Architecture Establishments – Disestablishments

The 420s decade ran from January 1, 420, to December 31, 429.

Events and trends

• Saint Augustine of Hippo publishes The City of God.
• Validity limit for the information on Western Roman Empire in the Notitia Dignitatum.
• 428—The Vandals pillage and destroy the cities in the province of Cyrenaica, including Cyrene, Ptolemais and Apollonia.

420s: Events by Year

Contents: 420 421 422 423 424 425 426 427 428 429

420

By place

Europe

• The legendary Pharamond leads the Franks across the Rhine.

Asia

• The Jin Dynasty ends in China. Liu Yu (Emperor Wu of Liu Song) is the first ruler of the Song Dynasty.
• The Southern Dynasties begin in China.
• Bahram V succeeds Yazdegerd as king of Persia.

421

By place

Western Roman Empire

• February 8—Constantius III becomes Co-Emperor of the Western Empire.

Eastern Roman Empire

• June 7—Emperor Theodosius II marries Aelia Eudocia, formerly known as Athenais.

Persia

• Theodosius II declares war against the Sassanid.

422

By place

Eastern Roman empire

• End of the Roman–Sassanid war.

By topic

Art

• Church of Santa Sabina, Rome is started to be built by Bishop Priest Petrus of Illyria (approximate date).

Religion

• September 10—Pope Celestine I succeeds Pope Boniface I as the 43rd pope.

423

By place

Western Roman Empire

• On the death of Honorius, Joannes, a primicerius notariorum (senior civil servant), seizes the throne of the Western Roman Empire, and is declared emperor.

By topic

Religion

• Theodoret becomes bishop of Cyrrhus, Syria.

424

By place

Eastern Roman Empire

• Future Emperor Valentinian III is appointed Caesar.

Asia

• Song Wen Di succeeds Song Shao Di as ruler of the Chinese Song Dynasty.

425

By place

Western Roman Empire

• October 23—Valentinian III becomes Western Roman Emperor.
• Aëtius leads an army into Italy to support the self-proclaimed emperor Joannes.
• Galla Placidia becomes a regent for her son.

Eastern Roman Empire

• The Sanhedrin is disbanded by the Roman Empire.

By topic

Arts and sciences

• Last known usage of Demotic.
• c. 425–426 – Mausoleum of Galla Placidia, Ravenna, Italy, is built.

Religion

• Buddhism begins to spread to Southeast Asia.

426

By place

Europe

• King Gunderic of the Vandals becomes king of the Alans as well (approximate date).

By topic

Religion

• Saint Augustine of Hippo publishes the De Civitate Dei, City of God.
• Sisinnius becomes Archbishop of Constantinople.

427

By place

Europe

• The Roman province of Pannonia Prima is finally assimilated into the Hunnic empire

Asia

• Pyongyang is declared the capital of Goguryeo by king Jangsu.

428

By place

Europe

• Geiseric becomes King of the Vandals and Alans.

Asia

• Artashes, the last king of Greater Armenia, is deposed. The kingdom becomes a province of the Sasanian Empire.

By topic

Astronomy

• October 26—The planet Venus occults the planet Jupiter.

Religion

• April 10—Nestorius is made Patriarch of Constantinople.
• Hydatius becomes bishop of Aquae Flaviae in Gallaecia (modern Chaves in Portugal).
• John succeeds Theodotus as Patriarch of Antioch.
• Euthymius builds a monastery in Palestine, near the Dead Sea.

429

By place

Western Roman Empire

• Vandals under Geiseric cross from the Iberian Peninsula into Roman North Africa.

Eastern Roman Empire

• Theodosius II starts the reform of Roman law.
• Theodosius II orders all funds raised by Jews to support schools be turned over to his treasury.

By topic

Religion

• Pope Celestine I dispatches bishops Germanus of Auxerre and Lupus of Troyes to Britain to combat the Pelagian heresy.
• St. Hilary becomes bishop of Arles.
• Domnus II, future Patriarch of Antioch, is ordained as a deacon.