Kaštilac (Croatian Kaštilac) was fortress of Benedictine Catholic Monastery, and now is a settlement in Kaštel Gomilica, located in the central part of Split-Dalmatia county, in central Dalmatia, Croatia.
King Zvonimir of Croatia of the Svetoslavić branch of the House of Trpimirović, had donated to a Benedictine from Split possession in the Kaštela field (Kaštelansko polje) in 1078. In the 12th century Benedictine built a church of St. Cosmas and Damian in the Romanesque Architecture style.
Due to the Turkish threat, Benedictine nuns completed the construction of a fortified settlement Kaštilac on the islet of Gomilica in 1545. Entrance to the castle is protected by high tower over the stone bridge with arches. Kaštilac is 40 m away from the shore, connected with the stone bridge, which just to be of stone. Fortress has square floor plan and in the past, at the entrance was located drawbridge. After the fortress was completed, within the fortification walls arrived inhabitants of the Upper and Lower Kozica, after the Turks had devastated their former villages. In 17th century the tower lost its defensive function.
Kaštilac is the only castle of seven castles in Kaštela, which is on all sides reflected by the Adriatic sea.
