The founder, and maybe the builder too, was probably Domaslav (Domaslaus de Squorz) around 1279, an important courtier and landed official, the butler of Queen Kunigunda of Slavonia(1262) and her food taster (1263–1269, 1279), Lord High Treasurer (1267–1278) and one of the ten Burgraves of Prague Castle. From the castle he built, only the deep well is now preserved, cut in the granite rock, which was situated near to the early gothic palace - that standing on the site of the present school building.