368

By place

Roman Empire

• Spring - Emperor Valentinian I and his 8-year-old son, Gratian, cross the Rhine with an army into Alamannic territory. He defeats the Alemanni and burns food stores along the border. A temporary peace is signed with Macrian, king of the Bucinobantes, and Valentinian returns to his capital Augusta Treverorum.
• Great Conspiracy: Picts, Scotti and Saxons reach Roman London and plunder the city. Theodosius, a general, is sent with a relief force to Britannia. He marches from Richborough, Kent, to deal with the invaders.
• Winter - The barbarians are driven back to their homelands, Hadrian's Wall is retaken and order returns to the Roman diocese. Theodosius reorganises the abandoned forts and mounts punitive expeditions in Hibernia.

  Asia

• An earthquake strikes Nicaea.