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Mezek Fortress (Neuseticon or Neutzikon) is a medieval Byzantine fortress built in 11-12 centuries west of today's village Mezek, Svilengrad Municipality. It is situated on an elongated terrace, shaped at the foot of a steep branch of the northeastern Rhodope Mountains, bearing the name St. Marina or Forest. The local population calls the fortress "Kaleto". The fortress had the functions of a border guard fortress. It has protected territories between the rivers Maritsa and Arda.