 In 1886 Said Ali bin Said Omar, Sultan of Bambao, signed an agreement with the French government that allowed France to establish a protectorate over the entire island of Ngazidja (Grande Comore); protectorates were also established over Ndzwani (Anjouan), and Mwali (Mohéli island in French) the same year.Résidents were posted on the three islands.On 9 April 1908, France declared the protectorates and Mayotte a single colony, Mayotte and dependencies.