Ot·to I 
(ŏtō, ôtō) also O·tho I (ōthō, ōtō) Known as "Otto the Great." 912-973.
(ŏtō, ôtō) also O·tho I (ōthō, ōtō) Known as "Otto the Great." 912-973. King of Germany (936-973) and first Holy Roman emperor (962-973). He brought Italy and Burgundy under German control.