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Η οχύρωση της Θεσσαλονίκης ανάγεται στα χρόνια του Κασσάνδρου. Τα τείχη όμως που στέκονται ακόμη όρθια κατασκευάστηκαν στα χρόνια του Θεοδοσίου (τέλος 4ου αι. μ.Χ.) και επισκευάστηκαν πολλές φορές αργότερα για να αντέξουν στις επιδρομές των βαρβάρων. The fortification of Thessaloniki can be traced back to the time of Cassander. However, the walls still standing today were constructed during the reign of Theodosius (late 4th cent. A.D.) and were later repaired many times in order to withstand the barbarian invasions.