In the southeastern part of the fortress, near the Mountain Gate, the so-called tripartite vaulted building is located. It is the only surviving building of the Venetian military accommodations of the garrison. The three single-room chambers that comprise the above mentioned accommodations are housed with semi-circular barrel vaults and a separate entrance door. The chambers' vaults are placed stepwise, contributing to the rainwater collection, which supplies a small cistern north of the lower room.

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