The castle of Moudros was one of the most fortified ones on Limnos, along with the one in Myrina and Kotsinos. Although currently destroyed, it bears witness to the fortification of the city, possibly by the Venetian Navigajoso, who built extensive defensive works on the island around 1207 - 1214. 

During the 15th century the fortress of Kotsinos was one of the most powerful ones on the island. During the period when Limnos was under Venetian occupation, the Castle was attacked four times by the Ottomans, who caused very serious damage. Very little is left in the way of fortress ruins near the present day small harbour of Kotsinos.

At present there is the Church of Zoodochos Pigi with the subterranean Agiasma (Holy Water) and the statue of Maroula. The castle of Kotsinos is associated with the legendary Maroula, the heroic nobleman’s daughter, who, during a siege by the Ottomans, successfully defended the city with her father’s sword, after he had been killed. 

The castle of Myrina is one a most famous and well preserved castle. It took on an early form in the early 12th century and its fortications were reinforced in 1185 by emperor Andronicus I, Comnenus. The rock on which the castle is built divides Myrina coast into two parts, namely, the Romeiko (Greek) and the Turkish beaches.

Source: North Aegean Region - https://www.pvaigaiou.gov.gr