Quite a lot is known about the building because an image of it is engraved on a 13th-century chapterhouse seal, and some of its remains and foundations are well preserved; besides the lower 12 meters of the Silver Bell Tower, the trinavel St. Leonard's Crypt, the rotunda by the Bastion of Ladislaus IV of Hungary (once a baptistery and the rotunda by the Sandomierska Tower all date from this era, as does a church near the Dragon's Cave.