Compared to East African countries such as Tanzania, Kenya, and Uganda, the history of Islam in Rwanda is relatively modern. While a few written sources are available regarding its origins, it is claimed that Islam came through Arab traders from Zanzibar who first entered the country in 1901. Alternatively, it has been argued that Islam arrived during the colonial period when Muslim clerks, administrative assistants, and merchants from the Swahili-speaking coast of Tanganyika were brought to the country. Islam was also bolstered by Muslim merchants from the Indian subcontinent, who married local Rwandans. Rwandans built their first mosque in 1913. This mosque is known as Al-Fatah Mosque.