  otto iii (jun/jul 980 - january 23, 1002) was holy roman emperor from 996 until his early death in 1002. a member of the ottonian dynasty, otto iii was the only son of the emperor otto ii and his wife theophanu. otto iii was crowned as king of germany in 983 at the age of three, shortly after his father's death in southern italy while campaigning against the byzantine empire and the emirate of sicily. though the nominal ruler of germany, otto iii's minor status ensured his various regents held power over the empire. his cousin henry ii, duke of bavaria, initially claimed regency over the young king and attempted to seize the throne for himself in 984. when his rebellion failed to gain the support of germany's aristocracy, henry ii was forced to abandon his claims to the throne and to allow otto iii's mother theophanu to serve as regent until her death in 991. otto iii was then still a child, so his grandmother, the dowager empress adelaide of italy, served as regent until 994. in 996, otto iii marched to italy to claim the titles king of italy and holy roman emperor, which had been left unclaimed since the death of otto ii in 983. otto iii also sought to reestablish imperial control over the city of rome, which had revolted under the leadership of crescentius ii, and through it the papacy. crowned as emperor, otto iii put down the roman rebellion and installed his cousin as pope gregory v, the first pope of german descent. after the emperor had pardoned him and left the city, crescentius ii again rebelled, deposing gregory v and installing john xvi as pope. otto iii returned to the city in
1002_deaths 10th-century_monarchs_in_Europe 11th-century_monarchs_in_Europe 980_births German_kings Holy_Roman_Emperors Imperial_Roman_consuls Medieval_child_rulers Ottonian_dynasty People_from_Kleve_(district) Roman_Catholic_monarchs