Kigali remainder of the colonial era, as much of the administration took place in Ruanda-Urundi's capital Usumbura, now known as Bujumbura in Burundi. Usumbura's population exceeded 50,000 during the 1950s, and was the colony's only European-style city, while Kigali's population remained at around 6,000 until independence in 1962. Kigali become the capital upon Rwandan independence in 1962. The traditional capital was the seat of the "mwami" (Kings Yuhi V, Mutara III and Kigeli IV) in Nyanza, while the colonial seat of power was in Butare, then known as Astrida. Butare was initially the leading contender to be the capital of the
Kigali being built in the 1920s by the Belgian colonial government as a home for civil servants and Swahili traders. This latter group were mostly members of the Islamic faith, which led to Nyamirambo being known as the "Muslim Quarter". Nyamirambo's Green Mosque ("Masjid al-Fatah") is the oldest mosque in Kigali, dating back to the 1930s. Travel publisher Rough Guides has described Nyamirambo as "Kigali's coolest neighbourhood", citing its multi-cultural status and an active nightlife, which is not found in much of the rest of the city. North of Nyamirambo, and west of the CBD is Nyabugogo. Situated at the lowest