Anjouan (ɑ̃.ʒu.ɑ̃) is an autonomous volcanic island in the Comoro Islands in the southwestern Indian Ocean, part of the Union of the Comoros. It is known in Shikomori as Ndzuani, Ndzuwani or Nzwani, and, until the early twentieth century when the name fell out of general use (although still sometimes used by English-speakers in Zanzibar), in English as Johanna. Historically it was also called Hinzuan or Hanzoan. Its chief town is Mutsamudu and, , its population is around 277,500. The total area of the island is 424 square kilometers (163 square miles). History of Comoros The first inhabitants of the island were Bantu-speaking peoples from eastern Africa and navigators from Indonesia and Southwest Asia. In the late fifteenth century high status Hadrami Arab immigrants married into the local ruling classes and established a sultanate that extended its control over the entire island and occasionally extending their influence to the neighbouring island of Mwali and Mayotte. In 1812, Sultan Alawi bin Husain requested British assistance against Malagasy slavers who were threatening his domain, which was turned down. Nevertheless, the island remained within the British sphere of influence until the late 19th century. In 1886 France, already present in Mayotte, established a protectorate over the island; slavery was abolished in 1899, and in 1912, following the forced abdication of the last sultan, France formally annexed the island. John Mucknell marooned his enemies on Anjouan in 1644. His ship, the John, was owned by the East India Company, but after ridding himself of opposition in this manner, he turned pirate and returned to Britain. Anjouan joined the State of Comoros when it became independent in 1975, with Ahmed Abdallah as president of the State of Comoros. The island, being a part of the country, has gone through more than 20 coups since independence and has experienced several attempts at secession. In 1997, the islands of Anjouan and Mohéli seceded from the Comoros.