1184 ⟶ Emperor Frederick I's Diet of Pentecost in Mainz

Diet of Pentecost organised by Emperor Frederick I in Mainz.

Year

1125

1153

1177

1184

1220

1226

👑 Lothair of Supplinburg Elected Holy Roman Emperor, Sparking Guelph-Ghibelline Conflict

Lothair of Supplinburg, duke of Saxony, is elected Holy Roman Emperor instead of the nearest heir, Frederick of Swabia, beginning the great struggle between Guelphs and Ghibellines.⟶

Holy Roman EmpireSuccessionEmperorDynastic Conflict

Germany

🤝 Treaty of Constance: Frederick I and Eugene III Forge Alliance

The First Treaty of Constance is signed between Emperor Frederick I and Pope Eugene III, by the terms of which, the emperor is to prevent any action by Manuel I Comnenus to reestablish the Byzantine Empire on Italian soil and to assist the pope against his enemies in revolt in Rome.⟶

Holy Roman EmpireCatholicismFrederick IMedieval PoliticsTreatyByzantine EmpireDiplomacy

Germany

Italy

📜 Treaty of Venice: Papal Victory over Emperor Frederick I

The Treaty or Peace of Venice is signed by the papacy and its allies, and Frederick I, Holy Roman Emperor. The Norman Kingdom of Sicily also participates in negotiations and the treaty thereby determines the political course of all of Italy for the next several years.⟶