Furzey Island theorized that Green Island was a centre of production that exported its goods to continental Europe. This theory lends further evidence to Green Island having once been an important port. Furzey Island Furzey Island is an island in Poole Harbour in the English county of Dorset. The island lies to the south of the larger Brownsea Island. Seen from the water, or adjoining land, the island looks like another wild pineclad island. However, hidden in the trees are twenty-two oil wells split into 2 well-sites for the Wytch Farm Oil Field, which is linked by pipeline to Hamble on Southampton
Brownsea Island Viking raid to the harbour and used Brownsea as a base to sack Wareham and Cerne Abbey. In the 11th century the owner of the island was Bruno, who was Lord of the Manor of Studland. Following his invasion of England, William the Conqueror gave Studland, which included Brownsea, to his half-brother, Robert de Mortain. In 1154, King Henry II granted the Abbot of Cerne the right of wreck for the island and the abbey continued to control the interests of Brownsea for the following 350 years. After the Dissolution of the Monasteries, control of Brownsea passed to the Crown.