Discusses the fortification and partial rebuilding of the abbey by cardinal Giuliano Della Rovere (later pope Julius II), 1472-1494. Supports the attribution of the Renaissance portal of the main tower (and perhaps the planning of the whole fortress) to Baccio Pontelli, but favors attribution of the cardinal's palace (Palazzo del Cardinale Commendatore) to Giuliano da Sangallo.
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