AD 420
{{redirect|420 (year)|the year of the pre-Julian Roman calendar|420 BC}}
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File:Revoil Pharamond eleve sur le pavois.jpg is lifted on the shield by the Franks, by Pierre Révoil, 1841, and Michel Philibert Genod, 1845]]
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Year 420 (CDXX) was a leap year starting on Thursday of the Julian calendar. At the time, it was known as the Year of the Consulship of Theodosius and Constantius (or, less frequently, year 1173 Ab urbe condita). The denomination 420 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Events
= By place =
== Roman Empire ==
- The Franks cross the Rhine and invade Northern Gaul. In Italia an army is prepared to campaign with Castinus as chief.
- Comes Asterius conducts campaign in Gallaecia and ends the usurpation of Maximus.
- A Roman army under command of vicar Maurocellus suffers a defeat at Braga in Gallaecia.
== Persia ==
- Yazdegerd I dies after a 21-year reign, and is succeeded by his son Bahram V, who becomes head of the Persian Empire.
- Abdas, bishop of Susa, is accused of burning down one of the fire temples of Ahura Mazda, and after refusing to rebuild it, he is executed, under orders of Shah Yazdegerd I.
== Asia ==
- July 10 – The Jin Dynasty ends in China. Liu Yu (Emperor Wu of Liu Song) becomes the first ruler of the Liu Song Dynasty. The capital of the dynasty is Nanjing.Bernard Grun, The Timetables of History, Simon & Schuster, 3rd ed, 1991. {{ISBN|0671749196}}
- The Southern Dynasties begin in China.
- Guisin becomes king of the Korean kingdom of Baekje.{{cite web |title=List of Rulers of Korea |url=https://www.metmuseum.org/toah/hd/koru/hd_koru.htm |website=www.metmuseum.org |access-date=20 April 2019}}
- The Gupta Empire reaches its peak territorial extent under Chandragupta II and his son Kumaragupta I.
Births
- Anthemius, emperor of the Western Roman Empire
- Ecdicius, Roman general (magister militum)
- Euric, king of the Visigoths (d. 484)
- Libius Severus, emperor of the Western Roman Empire
- Majorian, emperor of the Western Roman Empire
- Palladius, caesar and son of Petronius Maximus
- Valamir, king of the Ostrogoths (he is also thought to have been born in 425 AD{{Cite web|title=Kings of the Franks|url=https://www.historyfiles.co.uk/FeaturesEurope/FranceKings.htm#:~:text=Pharamond%20(c.370-426)&text=In%20420,%20he%20reportedly%20led,who%20had%20settled%20near%20Cologne.|access-date=2021-03-29|website=www.historyfiles.co.uk}})
- Yuan Can, high official of the Liu Song Dynasty (d. 477)
Deaths
- January 21 – Yazdegerd I, king of the Sassanid Empire
- February 26 – Saint Porphyry, bishop of Gaza (Palestine)
- September 30 – Saint Jerome, priest and translator of the Bible
- Saint Abdas, bishop of Susa (Iran)
- Li Xin, duke of the Chinese state Western Liang
- Orosius, Christian historian and theologian (approximate date)
- Pelagius, British monk (approximate date)
- Yao, empress consort and wife of Mingyuan