260

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

 Events 
 By place 
 Roman Empire 
 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).

 Asia 
 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.

 By topic 
 Arts and sciences 
 Earliest known date of chess.

 Religion 
 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.

 Births 
 Jin Huidi, emperor of the Jin Dynasty (approximate date)
 Gaius Galerius Valerius Maximianus, Roman Emperor (d. 311)

 Deaths 
 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)

Category:260s