Built over a mosque
After Afonso Henriques took Lisbon in 1147, the cathedral was begun on the site of the city's main mosque.
Lisbon's oldest church, begun right after the Christian conquest of 1147, looks more like a castle than a cathedral. Here's what you're looking at, and what to listen for when you get there.

After Afonso Henriques took Lisbon in 1147, the cathedral was begun on the site of the city's main mosque.
Lisbon's patron is São Vicente. By legend, two ravens watched over his relics on the boat that brought them to Lisbon from the Algarve in 1173; they're still on the city's coat of arms.
Excavations in the Gothic cloister have uncovered Roman, Moorish and medieval remains, layer on layer.
Construction began soon after the Christian conquest of Lisbon in 1147, which makes it the city's oldest church.
Its thick walls, small windows and crenellated towers come from the Romanesque period, when churches also served as strongholds.
By legend, two ravens guarded São Vicente's relics on the boat that carried them to Lisbon in 1173.