The Palace is one of the most important buildings of the sanctuary, since it was the last and most complete in a series of buildings for the «Events» and «Grounds» of the first degree of initiation. It is built on the oldest building foundations, contemporary or little later of the Dome of Arsinoefrom whichpreserved only the lower part of the foundation and the western part of the south.
It is a rectangular building NorthWest-SouthEast orientation, which dates back to the early imperial period (around the 1st century ). In the westernfacade there were three entrances, of which the center was larger than the two smaller side ones. The walls of the building, which is on the south sideare maintained at a height of 3 m., and are built in the polygonal system on the facades, while the space between them was filled with pebbles.
Along the long wall of the building protruding internally eight pillars, four on each side, built with angled stones, which were used to support the roof beams while an intermediate wall formed on the elevated northern part of building an inner sanctuary, a small holy sanctuary, where the entrance was allowed only after the initiation. Two bronze statues of Kaveires with raised hands framed doorways that interrupted the wall of the inner sanctuary and perhaps underlie a wooden bulkhead that separated the sanctuary from the main hall.
The floor of the palace was earthen, while the interior walls and the pillars were coated with white plaster. The notches along the east wall and part of the north testify that there was a wooden platform. In the southeast corner of the main hall was one stone construction, which surrounded a pit libations, while the center of the room, near the eastern wall, detected the remains of a wooden circular pedestal.