In 1207 the Ghisi brothers captured the island .
In 1207 the Ghisi brothers built the Bourtzi , a small Venetian - styled fortress similar to the Bourtzi in Nafplio , on an islet just out of Skiathos Town , to protect the capital from the pirates .
In 1207 the Ghisi brothers captured the island and built the Bourtzi , a small Venetian - styled fortress similar to the Bourtzi in Nafplio , on an islet just out of Skiathos Town , to protect the capital from the pirates .