This basilica predates St. Vitus's Cathedral being founded by Prince Vratislav (915-21). It is the most well-preserved Romanesque church in Prague. This basilica was enlarged in 973 when the adjoining St. George's Convent was established. After a fire in 1142, the basilica was rebuilt. The large twin towers have been extensively restored to keep the basilica in its original appearance. The widow of the 9th century ruler Prince Bořivoj, Ludmilla is buried inside. She became Bohemia's first female Christian martyr. Also, other members of the Přemyslid dynasty are buried here.