1153 ⟶ Treaty of Constance: Frederick I and Eugene III Forge Alliance

The First Treaty of Constance is signed between Emperor Fred...

Year

1122

1153

1177

1184

1220

1228

📜 Concordat of Worms Ends Investiture Controversy

On September 23, the Concordat of Worms (Pactum Calixtinum) is drawn up between Emperor Henry V and Pope Calixtus II bringing an end to the first phase of the power struggle between the papacy and the Holy Roman Empire.⟶

Middle AgesHoly Roman EmpireCatholicismInvestiture ControversyChurch and StateHenry VTreatyDiplomacy

Germany

Italy

🤝 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.⟶