Royal mausoleum at Bobovac primarily as a classic church was built for the court's purposes, then in the first decade of the 15th century – under the rule of Stjepan Ostoja – was turned into a churchyard chapel dedicated to St. Michael, patron of chivalry. At the time church received a rich stone decoration – among others, ornaments on the doors and windows, anthropomorphous console, sclupture of a certain saint and sclupture of a lion. Entire mausoleum was adorned by a fresco painting, among others by the striking composition of the last judgment. Late-Ghotic and early Renaissance characteristics of the fragments tolerate their dating in span of the time between year 1420 and 1463. Based on a stylish resemblance between Bobovac's fragments and a fresco painting from st. Dujo chapel, it is presumed that an author of Bobovac's frescos could be a famous painter of Zadar and Split, Dujan Vušković.
Finds from graveyard chapel-mausoleum where were buried kings Stjepan Ostoja (1398-1404; 1409-1418), Tvrtko II Tvrtković (1404-1408; 1420-1443) and Stjepan Tomaš (1443-1461) and also a wife of Tvrtko II, Doroteja Gorjanska, especially three headstones deserve a special attention. Carved in red marble that was brought from Pannonia (Siklos, Ostrogon or Erdelj), they are an unique phenomenon in Bosnia and Herzegovina. The headstones were lying on a specially built compoitional sarcophagus, around 90 cm tall. On all three headstones, in high relief, were carved the images of deseased with insignias of the royal power and position, and there was an epitaph stretching along the edge of the headstones.
Archeology research of Bobovac was conducted from 1959 until 1967 under the expert guidance of the late Pavao Anđelić and by that time reconstruction of the mausoleum was completed. The items founded at Bobovac have been exhibited at the Country museum in Sarajevo.