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      During its continuous existence the town was fortified many times. Fortress walls from the following periods have been preserved:

Thracian - built in 8 BC from stone and mud;

Greek- (5 - 3 century BC) - from big stone blocks;

early Byzantine - (5 - 6 century) - built in " opus mixtum " - alteration of stone and brick belts; During the Middle Ages (7 - 15 century) early Byzantine fortress walls with insignificant reconstructions were used.