Pre-romanesque stone-cutting production called Master of the Koljane pluteus was shortly active at the beginning of the 9th century. The fragments which today are attributed to to this stone-cutting production were investigated for the first time at the beginning of the 19th century. However, it took a long time to connect all the fragments to one author, what happened in 1980, when this stone-cutting production was identified and named by Nikola Jakišić. He named it after the most beautiful and preserved pluteus which was found in the locality of Crkvina in Koljane. This Master can be identified by its characteristic style of conspicuous horror vacui, composition playfulness and rhythmical motives like doves, flowers and circles. Up until today, the work of Master of the Koljane pluteus was recorded on several localities on the territory of the Duchy of Croatia - Crkvina in Koljane, Crkvina in Biskupija near Knin, Galovac near Zadar, Rižinice in Rupotine near Solin and Stombrate in Bijaći. Also, a fragment kept in Archeological museum in Split today, is considered to be a work by this stone-cutting production. Fragments found in Bol on island Brač and in Kali on island Ugljan are also attributed to Master of Koljane pluteus, but it is considered that these fragments were transferred there since there are no records of work of Master of the Koljane pluteus outside of the territory of the early medieval Duchy of Croatia. Considering that most of the localities where this stone-cutting production’s work was recorded were one of the most important ones for the Duchy, this workshop can even be seen as a “duke’s stonecutter”.