With the start of construction of the fort and the town of Karlovac is related to the legend of its foundation on - skulls. The historian Radoslav Lopašić in the book "Karlovac - History and mjestopis city and its surroundings," published by the 1879th year, said that the first foundation was laid Karlovac "... on July 13 1579th day of St. Margaret to nine hundred Turkish head ...".