456

By place

Roman Empire

• March - Emperor Marcian sends an embassy to Carthage to end the Vandal raids in the Mediterranean from their strongholds in North Africa, and quells disturbances on the Armenian frontier.
• Emperor Avitus sends a Germanic naval expedition under command of Ricimer to defend Sicily. They defeat the Vandals twice: on land at the Battle of Agrigentum, and in a sea battle off Corsica.
• Summer - Capua is destroyed by the Vandals. Ricimer is unable to end piracy in the western Mediterranean. Backed by his popularity, he gains the consent of the Senate for an expedition against Avitus.
• September 17 - Remistus, Roman general , is besieged with a Gothic force at Ravenna and later executed in the Palace in Classis, outside the city.
• October 5 - The Visigoths under King Theodoric II, acting on orders of Avitus, invade Spain with an army of Burgundians, Franks and Goths, led by their kings Chilperic I and Gondioc. They defeat the Suebi under King Rechiar on the river Urbicus, near Astorga ; this shatters the power of the Suebi. During the battle Rechiar is captured and later executed.
• October 17 - Battle of Placentia: Ricimer, supported by Majorian, defeats near Piacenza the usurper Avitus. They compel him to renounce the purple, and Avitus is obliged to become bishop of Piacenza.
• October 28 - The Visigoths brutally sack the Suebi's capital of Braga ; churches are burnt to the ground.

  Britannia

• Saint Patrick leaves Britain once more to evangelise Ireland as a missionary bishop. The Anglo-Saxons call the British nobles to a peace conference at Stonehenge, but turn on them and massacre almost everyone.

  Asia

• After a 10-year reign, Emperor Ankō is assassinated by the 10-year-old Mayowa no Ōkimi, in retaliation for the execution of his father. He is succeeded by his brother Yūryaku who becomes the 21st emperor of Japan.