The Cathedral of St. Ambrose is a prominent church located in Milan, Italy. It is dedicated to St. Ambrose, the city's patron saint, and is one of the most important examples of early Christian architecture. The cathedral features a mix of architectural styles, including Romanesque and Gothic elements, and is known for its stunning mosaics and intricate sculptures. Construction of the cathedral began in the 4th century and was completed in the 13th century. It houses the remains of St. Ambrose and is a significant pilgrimage site. The cathedral's impressive façade and beautiful interior attract many visitors each year.