Tutsi Hima speak the same language, but call their language Hima. In the Rwanda territory, from the 15th century until 1961, the Tutsi were ruled by a king (the "mwami"). Belgium abolished the monarchy in response to Hutu activism, following the national referendum that led to independence. By contrast, in the northwestern part of the country (predominantly Hutu), large regional landholders shared power, similar to Buganda society (in what is now Uganda). Under their holy king, Tutsi culture traditionally revolved around administering justice and government. They were the only proprietors of cattle, and sustained themselves on their own products. Additionally, their
Hutu of Rwandan national unity, but has been criticized as an attempt at historical revisionism. Still others suggest that the two groups are related but not identical, and that differences between them were exacerbated by Europeans, or by a gradual, natural split, as those who owned cattle became known as Tutsi and those who did not became Hutu. Mahmood Mamdani states that the Belgian colonial power designated people as Tutsi or Hutu on the basis of cattle ownership, physical measurements and church records. There is an ongoing debate as to whether the Hutu and Tutsi are really separate groups or not;