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Biography.com: Roscellinus, Johannes
Four sentences about his life.
Catholic Encyclopedia: Roscelin
Article by M. de Wulf on this scholar, his teachings, and his tritheistic heresy.
Columbia Encyclopedia: Roscelin
Concise entry from the 2001 edition.
History of Philosophy: Roscelin
Short footnoted article on this medieval thinker and his place in history, summarizing four points of his doctrine.