540
| Years: 536 537 538 539 – 540 – 541 542 543 544 | |
| Decades: 510s 520s 530s – 540s – 550s 560s 570s | |
| Centuries: 5th century – 6th century – 7th century | |
Events
- Byzantine general Belisarius conquers Milan and the Ostrogoth capital Ravenna.
- Ostrogoth king Witiges is succeeded by Ildibad.
- Pope Vigilius in letters to Emperor Justinian and Patriarch Mennas of Constantinople rejects Monophysitism.
- The Sassanids attack Dara and capture Antioch.
Births
- Pope Gregory I (approximate date)
- Galswintha, wife of Chilperic I of Neustria
- Myrddin Wyllt, later wild man of the woods and possible source for Merlin (approximate date).
Deaths
- Dionysius Exiguus (approximate date)
- Witiges, king of the Ostrogoths
- According to the Annales Cambriae, the year of the battle at Camlann, where King Arthur and his son Mordred killed each other.
Categories: 540