During the Frankish occupation, the administrative centre of every island was its castle. On the picture, the castle of Marco Sanudo in Naxos.
Athens, 2nd Ephorate of Byzantine Antiquities. Hellenic Ministry of Culture/ Archaeological Receipts Fund.
http://www.culture.gr/cgi-bin/showfr.cgi?1/0/http://www.culture.gr/2/21/212/21202n/g212bn04.html
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