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Millennium:	1st millennium
Centuries:	2nd century – 3rd century – 4th century
Decades:	230s 240s 250s – 260s – 270s 280s 290s
Years:	257 258 259 – 260 – 261 262 263

Year 260 (CCLX) was a leap year starting on Sunday of the Julian calendar.

Events

Battle of Edessa: Emperor Valerian is defeated by the Persians.
Valerianus I has a meeting with Shapur to talk about peace. The truce is betrayed and he is taken prisoner for the rest of his life.
Shapur I sends Valerian to Bishapur. The Roman army builds the Band-e Kaisar (Bridge of Valerian).
Gallienus becomes the new emperor of Rome.
Gallienus leaves the fortifications in the Black Forest area because of invading Alamanni.
Gallienus lives at Mediolanum (modern Milan).
Postumus, Roman usurper, forms the Gallic Empire.
Saloninus, son of Gallienus, is made Augustus by his troops.
Postumus kills Saloninus. He is made emperor.
Postumus wins over all the Roman provinces west of the Alps, including Gaul, Britain and Hispania.
The Roman fort of Wiesbaden (Germany) is captured by the Alamanni.
The Franks take control over the Scheldt estuary (approximate date).

Persian king Shapur I destroys Caesarea Mazaca in Asia Minor.
Cao Huan succeeds Cao Mao as ruler of the Chinese Kingdom of Wei.
Syria, Egypt and Palestine break off from the Roman Empire to form the Persian-supported Palmyrene Empire.

Pope Dionysius makes bishop Dionysius of Alexandria explain why he is separating the members of the Trinity as three distinct gods.
Paul of Samosata becomes Patriarch of Antioch.

Cao Mao, ruler of the Chinese Kingdom of Wei (killed in an abortive coup d'état against Sima Zhao) (b. 241)
Chen Tai, minister of the Kingdom of Wei
Saloninus, Roman emperor and son of Gallienus
Sun Liang, Emperor of the Chinese Kingdom of Wu (b. 243)
Valerianus I, Roman emperor (approximate date)