Historical building (14th - 15th century) situated between the central gate of the castle of Chios and the main square of the walled part of the town. It was perhaps the head quarters of the Genoese Podesta. Disfigured by Turkish alterations and additions, it was restored during the years 1980-1986 by the Archeaological Service.

The building, of a fortress - like appearance, has two floors of one room each, raised high above ground level. On its northern side there is a small loggia and a stone external staircase, leading to the walls and the SE tower of the castle.

In the actual exhibition Byzantine murals, post-Byzantine icons, Byzantine and Genoese sculptures and small-scale works of art are presented.