Europe was principally a geographical expression and subordinated to Christendom which was the dominant identity system in the West. The idea of Europe
(原始内容存档于2024-05-06). Bird, Jessalynn; Peters, Edward; Powell, James M. Crusade and Christendom: Annotated Documents in Translation from Innocent III to the Fall of
(原始内容存档于2021-02-06). Vlasto, Alexis P. The Entry of the Slavs Into Christendom: An Introduction to the Medieval History of the Slavs. Cambridge University