The church of Sant’Ambrogio was founded in 386 by St. Ambrose, who was born in Milan and is the city’s patron saint. The present church is a masterpiece of Romanesque architecture, built in the 12th century around the choir from an earlier ninth-century church.
There’s a lot to see here, beginning with the large portico, also from the ninth century, and the atrium, whose carved stone capitals and portals rank it high among Europe’s best examples of the Romanesque period.
Inside, be sure to see the pulpit with late Romanesque carving, and the richly carved 4th-century Stilicone sarcophagus underneath it. The casing (paliotto) of the high altar is a masterpiece of Carolingian art made in 835 at either Milan or Rheims. It’s easy to miss the mosaic dome of the original 4th-century Sacello di San Vittore, accessed through the last chapel on the right.