The First Treaty of Constance was signed between the

Emperor Frederick I Frederick Barbarossa (December 1122 – 10 June 1190), also known as Frederick I (german: link=no, Friedrich I, it, Federico I), was the Holy Roman Emperor from 1155 until his death 35 years later. He was elected King of Germany in Frankfurt on ...

and

Pope Eugene III Pope Eugene III ( la, Eugenius III; c. 1080 – 8 July 1153), born Bernardo Pignatelli, or possibly Paganelli, called Bernardo da Pisa, was head of the Catholic Church and ruler of the Papal States from 15 February 1145 to his death in 1153. He w ...

in 1153. By the terms of the treaty, the Emperor was to prevent any action by

Manuel I Komnenos Manuel I Komnenos ( el, Μανουήλ Κομνηνός, translit=Manouíl Komnenos, translit-std=ISO; 28 November 1118 – 24 September 1180), Romanization of Greek, Latinized Comnenus, also called Porphyrogennetos (; "born in the purple"), w ...

to reestablish the

Byzantine Empire The Byzantine Empire, also referred to as the Eastern Roman Empire or Byzantium, was the continuation of the Roman Empire primarily in its eastern provinces during Late Antiquity and the Middle Ages, when its capital city was Constantinopl ...

on Italian soil and to assist the pope against his enemies in revolt in

Rome , established_title = Founded , established_date = 753 BC , founder = King Romulus (legendary) , image_map = Map of comune of Rome (metropolitan city of Capital Rome, region Lazio, Italy).svg , map_caption ...

. In 1155, as part of the agreement securing his imperial coronation, Frederick reaffirmed the terms of Constance for

Pope Adrian IV Pope Adrian IV ( la, Adrianus IV; born Nicholas Breakspear (or Brekespear); 1 September 1159, also Hadrian IV), was head of the Catholic Church and ruler of the Papal States from 4 December 1154 to his death in 1159. He is the only Englishman t ...

. The

Second Treaty of Constance The Peace of Constance (25 June 1183) was a privilege granted by Frederick I, Holy Roman Emperor, and his son and co-ruler, Henry VI, King of the Romans, to the members of the Lombard League to end the state of rebellion (war) that had been ong ...

made peace between the Emperor and the Lombard League in 1183.

Sources

* Norwich, John Julius. ''The Kingdom in the Sun 1130-1194''. Longmans: London, 1970. {{Italy-hist-stub 1153 1153 in Europe

Constance Constance may refer to: Places *Konstanz, Germany, sometimes written as Constance in English *Constance Bay, Ottawa, Canada * Constance, Kentucky * Constance, Minnesota * Constance (Portugal) * Mount Constance, Washington State People * Consta ...

12th-century treaties