The castle was a site of Dzików Confederation of 5 November 1734, led by Adam Tarło, starosta from Jasło, organized in order to reinstate Stanisław Leszczyński as a king of Poland after the death of August II the Strong.

The Polish Rider by Rembrandt, also known as Lisowczyk, one of the most valuable paintings in Poland was found in Dzikovia Tarnowski collections.

Later all sorts of state institutions seized them, e.g. they are in a Łańcut Castle, close to 500 exhibit items around Dzikowia, and in the Rzeszów Museum there are over 80.

The deposited part was only left scarce in the West, quite a lot of it, however, went missing without trace with eastern areas seized by Soviets.

In 1974, a treasure chest was discovered in the basements of the palace consisting of old collections of silverware with a considerable number of precious Polish artifacts.

[5] In 2011, the entire collections of the Historical Museum of the City of Tarnobrzeg (Polish: Muzeum Historyczne Miasta Tarnobrzega) were moved to the castle.