Master Bolfgangus is one of the peaks of Slovene late Gothic wall panting. In 1453 he dated the frescoes in the north nave of the pilgrim Church of the Annunciation at Crngrob, where he painted the Nativity scene (NG S 1620), his patron saint St Wolfgang, St Bartholomew and four female saints: Sts Dorothea, Catherine, Barbara, and Margaret (NG S 1437). 

His work combines idealism, which is manifested in the grace of faces and gestures, and contemporary realism that came to the Slovene lands from the northern countries. On the lower right-hand wall of the northern nave of Crngrob church he painted a group of four female saints who had lived in the first centuries of Christianity: St Dorothea with the divine boy, Child Jesus, who is offering her a basket of flowers; St Catherine with the spiked wheel; St Barbara with the tower; and St Margaret, donned in a richly decorated cloak and with a dragon at her feet. All of them died a martyr death and they are special intercessors in need and difficult situations. 

The painting of Master Bolfgangus is characterized by the refinement and grace of saintly figures, which are enriched by the aesthetic play of draperies, and he is especially recognizable by his characteristic rounded facial type.