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Pope Marcellus II - Wikipedia
Pope Marcellus I - Wikipedia
Marcellus II | Biography, Papacy, & Facts | Britannica
Pope Marcellus II | Catholic Answers Encyclopedia
Pope Marcellus Mass | Palestrina’s Masterpiece | Britannica
Marcellus II - Vatican
CATHOLIC ENCYCLOPEDIA: Pope St. Marcellus I - NEW ADVENT
Pope Marcellus II - PopeHistory.com
Marcellus II, Pope - Encyclopedia.com
Pope Marcellus II - Encyclopedia Volume - Catholic Online