Copleston will probably be better than Russell on the Middle Ages. I just read Bertrand Russell's section. It had very little philosophy and was almost entirely an historical account. Now, Russell's writing was superb and witty--I was chuckling at his description of corrupt popes, but there wasn't much exposition of philosophy.

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J. B. Atken
John Knox PCA
Layman, M.A. student at Louisiana College