Brownsea Island Girl Guides from 160 countries travelled to the island to take part in the celebrations. Also present on the Island that day were these 17 descendants of B-P - Robert, Michael; Gill, Robin, Crispin; Natasha; Rosie, Tristram, Louis; Daphne; Buzz, Ossian; Rawley, Branwen; Toby, Annarella; Emily. Brownsea Island is twinned with: Brownsea Island Brownsea Island (also archaically known as "Branksea") is the largest of the islands in Poole Harbour in the county of Dorset, England. The island is owned by the National Trust. Much of the island is open to the public and includes areas of woodland and heath with
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.