A valuable record of Gustav Rudolf Puff from 1846 lists the gallery of 130 paintings in the Betnava manor house, then owned by Count Klemen Brandis (1798-1863). At that time, works from Dürer, Michelangelo, and Rubens schools of painting, as well as works attributed to David Teniers, Anthony van Dyck, Hans Adam Weissenkircher, Giovanni Pietro de Pomis, Philips Wouwerman, Paolo Veronese and others, were hung in Betnava. Puff also mentions a collection of copper engravings. The owner of the mansion would give every visitor the opportunity to see the famous collection, which was displayed in four rooms.

After the construction of the Slivnica manor house, part of the collection of paintings from Betnava was moved to the new location. The 16 oil paintings remained in Betnava even after the manor house was handed over to the Diocese of Lavant. After the First World War, they were transferred to the Maribor Diocesan Palace. We do not know where the majority of the paintings from Betnava and Slivnica are today. Most likely the Brandis family kept part of the collection and took it with them when they moved to Tyrol. The fate of the paintings that were in the possession of Hermann Pauls, the owner of the Slivnica manor at the end of the 19th century, is also unclear.

The oil sketch of St George by Martin Knoller (1725-1804) probably comes from the collection of Count Brandis. It came to the Maribor Regional Museum from the Kozjak (Pachta) manor house and was still in Betnava in the mid-19th century.