The first church on the site dates to the 6th century and stood on a Roman propylaea, and it was later destroyed in the Lombard invasion. Two basilicas were built on the ruins between the 9th and 11th centuries. In the 14th century one nave of each was demolished and the two were joined behind a new asymmetrical facade. The infobox gives groundbreaking in 1302, completion in 1320 and consecration in 1385. The article names no architect or client.
Reused Romanesque stones were used for the 14th-century bell tower and facade, and the 12th-to-13th century apse mosaics survive. The style combines Romanesque and Gothic, including a Gothic rose window. Excavations in the 1930s exposed remains of the Roman forum.
Pope Leo XIII made it a minor basilica in 1899. It is the seat of the Bishop of Trieste.

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