What is 260?
{{Year nav|260}} [[File:HumiliationValerianusHolbein.jpg|thumb|The humiliation of Emperor [[Valerian]] ([[Hans Holbein the Younger]], ca. 1521)]] __NOTOC__ Year '''260''' ('''[[Roman numerals|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 [[Sassanid Empire|Persian]]s. * Valerianus I has a meeting with Shapur to talk about peace. The [[ceasefire|truce]] is [[betray]]ed 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 [[Ancient Rome|Rome]]. * Gallienus leaves the [[fortification]]s 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 (title)|Augustus]]'' by his troops. * Postumus kills Saloninus. He is made emperor. * Postumus wins over all the [[Roman province]]s west of the [[Alps]], including [[Gaul]], [[Roman Britain|Britain]] and [[Hispania]]. * The Roman [[castellum|fort]] of [[Wiesbaden]] ([[Germany]]) is captured by the Alamanni. * The [[Franks]] take control over the [[Scheldt]] [[estuary]] (approximate date). ==== Asia ==== * [[Sassanid dynasty|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 [[Persia]]n-supported [[Palmyrene Empire]]. === By topic === ==== Arts and sciences ==== * Earliest known date of [[Origins of chess|chess]]. ==== Religion ==== * [[Pope Dionysius]] makes bishop [[Dionysius of Alexandria]] explain why he is separating the members of the [[Trinity]] as three distinct gods. * [[Pa