St. George's Basilica is the oldest surviving church building within Prague Castle, Prague, Czech Republic. The basilica was founded by Vratislaus I of Bohemia in 920. It is dedicated to Saint George. The basilica was substantially enlarged in 973 with the addition of the Benedictine St. George's Abbey. It was rebuilt following a major fire in 1142. The Baroque façade dates from the late 17th century. A Gothic style chapel dedicated to Ludmila of Bohemia holds the tomb of the saint.