Prophet Muhammad and his followers start their journey from Mecca to Medina
Muhammad returns to Mecca
Muslims destroy the Church of the Holy Sepulchre
Fragmentation of Muslim Spain, beginning of Christian Reconquista
Leo III withdraws Byzantine provinces of southern Italy from papal jurisdiction.
Charlemagne summons the monk/scholar Saint Alcuin from York to head the palace school of Aachen, leading to a revival of learning in Europe.
Louis the Pious (Charlemagne's son) becomes Holy Roman Emperor and king of the Franks. He rules until 840.
Holy Roman Emperor Henry IV takes the throne as an adult. Henry IV's mother Agnes steps down. Henry rules the Empire until 1106.