阴土兔年 (female Earth-
Rabbit) 386 or 5 or −767 — to — 阳金龙年 (male Iron-
Dragon) 387 or 6 or −766
Year 260 (CCLX) was a
leap year starting on Sunday (link will display the full calendar) of the
Julian calendar. At the time, it was known as the Year of the Consulship of Saecularis and Donatus (or, less frequently, year 1013 Ab urbe condita). The denomination 260 for this year has been used since the early medieval period, when the
Anno Dominicalendar era became the prevalent method in Europe for naming years.
Events
By place
Roman Empire
Battle of Edessa: With a large army, said to number 70,000 men,
Valerian attempts to drive the Persians back from Edessa. The Roman army is surrounded and most of its troops are killed or captured. Valerian is taken prisoner for the remainder of his life.
King Shapur I sends Valerian to
Bishapur and uses the captured
Roman army for engineering plans. They construct the Band-e Kaisar ("Bridge of Valerian").
Gallienus establishes himself at
Mediolanum (modern
Milan); he reorganizes the army, supported by elite
cavalry, and dispatches troops to the
Rhine frontier.
Postumus executes Saloninus and his adviser Silvanus after breaching the walls of Cologne. He is recognized as emperor and establishes his capital at
Trier.
Emperor
Cao Mao of
Former Wei state attempts to lead a
coup against the powerful regent
Sima Zhao, but he himself is killed before it comes to a confrontation.
June 2 – Cao Mao is killed in a coup d'état against Sima Zhao. The 14-year-old
Cao Huan becomes ruler of Former Wei, but the Sima clan controls the state.
Pope
Dionysius convenes a
synod at Rome to demand an explanation from bishop
Dionysius of Alexandria, who has been charged with separating the members of the
Trinity as three distinct deities.