The Venetian fleet dominated the Aegean in the 13th century. The Ruler of Venice, Marko II Sanoudos, built a fortress with many round defence towers in the town of Chora on the Island of Nexos. Its Glezos (Crispi) tower is the only tower that still stands. It has five floors and above its entrance you can see the coat-of-arms of the Crispi family.