Saint Florent, bishop of Strasbourg who lived at the end of the 6th century, was buried in the first religious building on this site. Bishop Adeloch rebuilt the building around 820. The monks of Saint-Thomas showed their gratitude by commissioning him to make a sarcophagus, a masterpiece of Romanesque sculpture in Alsace (south-east part of the church), around 1130. A fire in 1007, followed by a lightning strike in 1144, completely destroyed the building. In 1196, it was rebuilt in its current form as a hall church with 5 Gothic naves. The only Romanesque features are the Saint-Blaise chapel (12th century) and the singletower westwork (1200-1220).