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The Romanesque Basilica of Sant'Ambrogio (Basilica di Sant'Ambrogio) is dedicated to Milan's patron saint, St. Ambrose, who founded the church in the fourth century while bishop of Milan. The saint’s remains lay beneath the stunning ninth-century Golden Altar, a masterpiece of gold, gilded silver, precious stones, and enamel. The basilica’s unique architecture makes it a must-see.