Medieval Europe 18: The Investiture Controversy (1075-1077)
The Medieval World - A podcast by W.J.B. Mattingly
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Heavy Interlude by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100515 Artist: http://incompetech.com/