„On the western edge of the Gynaikokastro hill there's a small basilica of post-Byzantine times. Historical data indicate that it was honored in the name of the Holy Martyr John or Nannos, who martyred in 1802.“
John Nannos was born in Thessaloniki in 1785 and martyred in Smyrni (Izmir) in 1802. His father was born in 1764 in Avret Hisar (Gynaikokastro) and his mother was from Northern Halkidiki. His father was a shoemaker and was working in Smirni; his two sons Theodore and John (Nannos) soon followed him. Due to the irresistible pressure of the Turks to embrace Islam John Nannos declared faith in Islam on May 3, 1802.
But on May 25 he was imprisoned because he aroused the suspicions of the Ottomans that his faith in Islam was fake. After multiple interrogations and torture, during which John refused Islam and declared faith to Christianity, he was executed in Soan Bazaar on May 29, 1802. His memory is honored by the Orthodox church on May 29 and miracles in his name have been heard. In the early 19th century a church was built in the name of John the Martyr close to his home village, in Avret Hisar (Gynaikokastro).
WIKIPEDIA, Paul Tsamantouridis