At the time of the renovation of the Bishops’ Residence in Kroměříž after the fire in 1752, Franz Anton Maulbertsch was invited to the town and in 1759 painted the fresco in the Feudal Hall the commission of Bishop Leopold von Egkh. Two drawings by attributed Monika Dachs to the painter Josef Stern in her thesis in 2003 were until recently considered as unexecuted variations of the central scene of The Apotheosis of Leopold von Egkh. The drawing Allegory with Fides, Justitia and Pictura (Graphische Sammlung Albertina, Wien) represents a part of the wall painting, executed in 1759 on the vault of the Great Library of the Castle by Josef Stern. Another drawing, Apotheosis with Saturn, Hercules and Fama (Ratjen Collection, National Gallery of Art, Washington), was after the style analysis attributed to Stern as well, but as a draft for composition of bishop's apotheosis in the Feudal Hall. This article proves Stern's authorship of both drawings. As regards the first of them, in accordance with final painting in the library the drawing's iconographic plan is revised and corrected (Doctrina, Justitia, Astronomia and Medicina). Another drawing from the Ratjen Collection is connected to the preserved written draft of the unexecuted painting in the Great Dining Room of the Castle Residence. This commission was ordered from Maulbertsch again according to the contract from 1760. The drawing adopts Maulbertsch's style and composition of Egkh's apotheosis in Feudal Hall, but it follows the motif of bishop's glorification, which was planned for the dining room. The reason of joint art work of the two painters at the dining room may be an extremely demanding scale of the commission – large area of the vault surface, that was to be covered by wall painting.