Henry IV (1050–1106) was King of the Romans from 1056 and Holy Roman Emperor from 1084 until his death. His reign was dominated by the Investiture Controversy ⓘ, the protracted struggle with the papacy over the appointment of bishops and the balance of spiritual and temporal authority.

His confrontation with Gregory VII ⓘ became one of the defining political and theological conflicts of the Middle Ages.

Early Reign

Henry succeeded his father, Henry III, Holy Roman Emperor, in 1056 at the age of six. His minority was marked by princely unrest and the erosion of royal authority. Upon assuming personal rule, he faced rebellions in Saxony and challenges to imperial control within Germany and Italy.

The Investiture Controversy

The crisis began in earnest when Gregory VII prohibited lay investiture. Henry rejected papal interference in episcopal appointments and convened a synod at Worms in 1076 that declared Gregory deposed. In response, Gregory excommunicated Henry.

The dramatic episode at Canossa in 1077, where Henry sought absolution from the pope, symbolised the moral power of the papacy. Yet the conflict resumed, leading to civil war within the empire and the election of rival kings.

In 1084 Henry entered Rome and secured imperial coronation. Gregory VII fled, and the struggle continued for decades.

Later Years and Deposition

Henry’s later reign was marked by renewed internal opposition. In 1105 his son, Henry V, Holy Roman Emperor ⓘ, rebelled and forced him to abdicate. Henry IV died in 1106, still formally under ecclesiastical censure.

Significance

Henry IV’s reign reshaped the medieval conception of authority. The Investiture Controversy weakened imperial dominance over the Church and strengthened the ideological claims of the papacy. The conflict defined the political landscape inherited by Henry V and culminated in the Concordat of Worms in 1122.