The chapel’s furnishings were part of the extensive reconstruction of the old Plumberk Mansion, which Anton Count Gaisruck transformed into his new residence, called Novo Celje Mansion. He hired established artists for the furnishings – the Wessobrunn stucco artist Joseph Göbhardt who made plans for the altar architecture, the painter Anton Jožef Lerchinger of Rogatec who furnished the chapel with paintings, the sculptural decoration was contributed around 1760 by the leading Graz sculptor Veit Königer, while the gilding is the work of the Graz painter Franz Josef Reich.

The sculptor was paid 540 gold coins for the work, which included, among other things, two telamons with the attributes of Heracles in front of the main entrance and statues of nymphs for the staircase of the Mansion (nowadays in the National Museum of Slovenia).

The figure of the saint stood on the left side of the altar. Despite the absence of some of the saint’s attributes, such as the five-star wreath around his head and the biretta and crucifix that he once held in his right and left hands, the saint can be recognized by his characteristic facial features – long brown hair and a close-cropped beard – and his clothing – a cassock, a rocchetto, and a fur ermine mozzetta tied around his shoulders.