The fortress contained three round turrets and a single gate in the northern wall that was protected by a rectangular turret. It has been identified with the location of Cratiscara, mentioned by Procopius, and it appears to have survived till the late sixth century, when all evidence of inhabitation ceases.
https://ses.library.usyd.edu.au/bitstream/2123/15784/1/larnach_mj_thesis.pdf