260

Roman Empire

 * becomes Emperor.
 * Gallienus defends what remains of the empire against barbarians and usurpers. He reorganizes the army and reforms the administration.
 * Gallienus reinforces the military and establishes a new mobile force supported by the cavalry, which becomes the pivot of the Roman army. The army's headquarters are established in.
 * The Roman fort of  is captured by the  (possibly ).
 * take control over the estuary (approximate date).

Asia

 * king destroys  in.
 * succeeds as ruler of the Chinese.
 * , and  break off from the  to form the n-supported.

Arts and Sciences

 * Earliest known date of.

Religion

 * becomes.

Births

 * (approximate date)

Deaths

 * , ruler of the Chinese (killed in an abortive  against )
 * (approximate date)
 * , emperor of the Chinese
 * , minister of the