Worlds at War: The 2,500-Year Struggle Between East and West - Anthony Pagden

3,5 stars - www.goodreads.com

p.120 - 1075 - pope Gregory VII vs Henry IV - Great Saxon Revolt
p.122 - For all that the Church could not intervene directly in secular affairs, it nevertheless lent the State a powerful ideological support.
Christianity conferred upon the raising European monarchies potentially unlimited power which would eventually carry them around the globe.
p.123 - Christianity had created distinction between the secular and the sacred, between the things of Caesar and those of God.