The stripping of the columns of the mullioned windows

There is an important connection between Castel del Monte and the Royal Palace of Caserta. It was 1757 when it was decided to recover material of artistic value from Frederick’s castle and reuse it in the factory of the Royal Palace of Caserta, then under construction based on a design by Luigi Vanvitelli by order of the King of Naples, Charles III of Bourbon. The materials chosen included several columns, suitable for a Gothic style portico in the Royal Palace's grove. The history of the spoliation of the castle's decorations is, however, much older: it is not known, in fact, by whom and when the marble columns of the three-lancet and double-lancet windows on the upper floor were stolen.

In this room there is one of the three fireplaces on the upper floor, unfortunately in a fragmented state due to the lack of a large part of the conical hood. On the sides of the fireplace there are two single-lancet windows overlooking the octagonal courtyard, while on the opposite side a double-lancet window opens onto the outside.

At the center of the vault, the keystone stands out thanks to a refined composition with four human heads alternating with vegetal motifs.