Founded by Prince Vratislav 1 (915-921), this basilica is the best preserved Romanesque church in Prague. It was extended in 973 when a new Convent of Church of St. George was built in its vicinity. After a big fire in 1142, the basilica had to be rebuilt. The façade is in Baroque style and dates back to the 17th century. There is a tomb of the first Bohemian Christian woman martyr Saint Ludmila, a widow of Prince Vratislav I., who reigned in the 9th century. St. Ludmila was strangled while kneeling in prayer. Other royalties of the Přemyslid dynasty are buried there as well.