The original basilica was built in the 4th century, but very little of it survived. The church before you was built during the 11th century. Before entering, notice the two impressive bell towers that turn its facade into an iconic one. At the entrance to the church there is a spectacular atrium and the interior of the basilica adorns wide pillars reminiscent of thick tree trunks.
Notice the altar made of gold, donated to the Basilica by King Carl the Great. The altar from the 8th century is considered a masterpiece of the Carolingian era.
Nearby is a 10th-century marble preacher's pulpit designed in the
Romanesque-Byzantine style and considered to be one of the most beautiful Romanesque creations in Italy.
In a small chapel on the right side of the church there are impressive mosaic paintings from the ancient church that stood here in the 5th century.
The Basilica of Sant'Ambrogio is named after the founder of it, Ambrose or Ambrogio, a 4th-century bishop who became the patron saint of Milan and is buried in the church. He is known here as one who was not deterred by the fear of the Roman emperors and managed to establish the church's control over their secular rule and the Roman Empire, and he was declared a Christian saint.