Which avent happened in the 11 century

This is what I could find

Explanation:

The eleventh century is, in European history, a century of change. ... It saw the final Christianisation of Scandinavia and the emergence of the Peace and Truce of God movements, the Gregorian Reforms, and the Crusades which revitalised a church and a papacy which survived tarnished by the tumultuous tenth century.

a social contract.

"a social contract is an agreement between citizens and their leader where the citizens give up certain freedoms in exchange for protection. the constitution of the united states is an example of a social contract."