Christian monarchs are rulers who govern based on Christian principles and often see their authority as divinely ordained. Throughout history, many European kings and queens, such as Charlemagne and Queen Elizabeth I, have integrated their faith into their leadership, promoting Christianity within their realms and using their power to support the Church. These monarchs often played significant roles in shaping the political and religious landscape of their countries. They established laws and policies that reflected Christian values, influenced the spread of Christianity, and sometimes engaged in conflicts, such as the Crusades, to defend or expand their faith.