 Mauritius claim that since Tromelin was a dependency of Isle de France, it was 'de facto' transferred to the United Kingdom in 1814.In addition, the islands of Rodrigues, Agalega, St Brandon and the Chagos Archipelago were also not specifically mentioned in the Treaty of Paris but became part of the British Colony of Mauritius as they were dependencies of Isle de France at that time.In addition, the British authorities in Mauritius have been taking administrative measures with respect to Tromelin over the years, for instance, British officials granted four guano operating concessions on Tromelin island between 1901 and 1951.