Otto I ⓘ (912–973), known as Otto the Great, was crowned Emperor in 962 and ruled until his death in 973. His reign established the durable political foundations of the medieval Holy Roman Empire.

Otto became King of East Francia in 936 following the death of his father, Henry the Fowler. Early in his reign he suppressed internal revolts and consolidated royal authority. His victory over the Magyars at the Battle of Lechfeld in 955 enhanced his prestige and secured the eastern frontiers.