You forgot the rest of the question...
Viderunt Omnes is an example of c. Notre Dame organum.
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not sure I don't watch jeopardy
Answer:
Romanesque churches designed with heavy wall pointed or round arches, vaults, and piers for columns. Romanesque architecture came to Europe after the crusade when Europeans went for religious war. Crusaders get to know the architectures of Byzantine Empire, built with thick wall, with fortifications. The metalworking also came for the fitting and decoration of buildings.
