The southern wing apartment of the Palace, which Antal Grassalkovich I rendered at the disposal of his friend, Count Kristóf Migazzi, Bishop of Vác and Cardinal Archbishop of Vienna, was converted into a theatre by Prince Antal Grassalkovich II between 1782 and 1785. The Palace theatre was opened earlier than the Castle Theatre that the Buda Carmelite church was converted into at the instigation of Farkas Kempelen in 1787.

The Pavilion on Royal Hill is the only remaining Baroque building in the Castle Park with portraits of leaders of the Original Settlement and Hungarian kings. The hexagonal building, 200 meters from the castle, was built by Antal Grassalkovich I in the 1760's. In the 17-18th century, lodgings of lords were often made look like galleries. It was partly to express their nobility, partly to show their history in pictures.

In the beginning, the suite of the Queen was characterized by her favoruite colour, violet. During the 1879 renewal, the colour of the silk wallpapers and upholstery was changed for red. The presence of the favourite colour is of special importancein this room since the furnishings here are meant to be suggestive of the Queen’s complex personality.