Vratislaus I of Bohemia founded the basilica within Prague Castle in 920, and the article calls it the oldest surviving church building there. The article also gives 921. A fire during the siege of 1142 damaged it, and repairs from 1145 to 1151 added two towers, the smaller northern Eve and the larger southern Adam.
It is mainly Romanesque, a three-aisled basilica with two towers at the east end, a square presbytery, an apse and a three-nave crypt. The late 17th-century Baroque facade was probably directed by Francesco Caratti. The article names no architect for the original basilica.
The mausoleum holds tombs of Přemyslid dynasty members. After Joseph II disbanded the monastic orders in the 1780s, the army used the buildings. In 1962 it became a concert hall, and it now houses the National Gallery's 19th-century Bohemian art collection.

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