Mombasa travels to the Swahili Coast and made some mention of the city, although he only stayed one night. He noted that the people of Mombasa were Shãfi'i Muslims, religious people, trustworthy and righteous. Their mosques are made of wood, expertly built. The exact founding date of the city is unknown, but it has a long history. Kenyan school history books place the founding of Mombasa as 900 A.D. It must have been already a prosperous trading town in the 12th century, as the Arab geographer Al Idrisi mentions it in 1151. The oldest stone mosque in Mombasa, Mnara, was built
Mombasa Island sprawl and industrial areas now occupy the rest of the island. Mombasa is linked to the mainland by the Makupa Causeway to the northwest, by the Nyali Bridge to the east and by the Likoni Ferry to the south. A road and rail bridge also serve the mainland container port near Port Reitz. Port Tudor and Tudor Creek were named by Owen Tudor the Royal Navy captain who first surveyed the area. Mombasa Island is one of the four divisions of Mombasa County. The division has a population of 146,334 (1999 census). It is divided into six subdivisions: Mombasa Island