Otto I of East Francia was crowned emperor by Pope John XII in Rome, establishing the Holy Roman Empire and a model in which royal/imperial authority relied heavily on bishops and abbots as imperial office-holders and vassals.
Gregory VII’s Dictatus papae (a set of 27 propositions preserved in his register) articulated an assertive theory of papal supremacy that sharpened the conflict over who could appoint and control bishops—central to the empire’s feudal governance.
Henry IV’s victory over Saxon rebels (1073–1075) strengthened the monarchy’s claim to enforce order among major princes, but the conflict also revealed how quickly powerful regional elites could unite against the king—an enduring feature of imperial feudal politics.
At the Synod of Worms, Henry IV and supportive bishops repudiated Pope Gregory VII and called on him to abdicate, escalating a dispute over episcopal appointments into a full church–empire constitutional struggle.
In response to Worms, Gregory VII excommunicated Henry IV and declared him deposed, releasing his subjects from their oaths—linking spiritual санкtions to feudal loyalty and giving princes leverage against the king.
Henry IV sought absolution from excommunication by doing penance before Gregory VII at Canossa. The episode became emblematic of how papal authority could disrupt imperial bonds of homage and fealty by delegitimizing a ruler.
The Concordat of Worms ended the first phase of the Investiture Controversy by distinguishing spiritual office from temporal regalia: bishops/abbots would be canonically elected, while the emperor retained a defined role in granting temporalities—reshaping imperial-princely relations by strengthening princes’ autonomy.
Henry V (last Salian) died childless, and the ensuing election produced Lothair III. The transition underscored that imperial kingship depended on princely election and consent, limiting hereditary claims and empowering leading princes and prelates.
Frederick I (“Barbarossa”) was elected king by an assembly of princes, illustrating the elective and negotiated character of rulership in the empire’s feudal order—where major dukes, counts, and bishops were decisive political actors.
Frederick I issued the Privilegium Minus, raising Austria from a march to a duchy and granting special inheritance provisions. It exemplified how emperors used enfeoffment and privileges to manage princely rivalries and structure territorial lordship.
Frederick I moved against Duke Henry the Lion, dispossessing him of major fiefs and reorganizing ducal power. The episode showed how emperors and rival princes could use feudal law (forfeiture/outlawry) to break overmighty vassals and redistribute territories.
The Peace of Constance ended the Lombard League’s rebellion and confirmed broad local and communal rights under imperial overlordship, demonstrating limits on imperial coercion and the growing legal-constitutional role of negotiated privileges within the empire.
Frederick II’s Confoederatio cum principibus ecclesiasticis conceded key regalian rights (e.g., tolls, mints, fortifications, jurisdictional powers) to bishop-princes to secure support—deepening the territorialization of power and weakening central monarchy in Germany.
The Statutum in favorem principum (issued by King Henry (VII) under pressure, later confirmed by Frederick II) extended comparable regalian and administrative powers to secular princes, formalizing a feudal-constitutional order dominated by territorial lordship.
Conrad IV’s death removed the main Hohenstaufen rival to William of Holland and intensified the Great Interregnum dynamic in Germany: weakened kingship, intensified princely autonomy, and fragmented enforcement of imperial authority.
Holy Roman Empire: Investiture, princes and imperial feudal relations (962–1254)
