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Master of the Ore Landriani and Giovan Battista de Lorenz Gian Giacomo Trivulzio with Saint Hieronymus in the Book of hours of Gian Giacomo Trivulzio Google Art Project. The Book of Hours of Gian Giacomo Trivulzio belonged to this Milanese condottiero passionate bibliophile who was born around in Milan and died in in Chtres SeineetOise