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In page Tutsi:

"

Prior to the arrival of colonists, Rwanda had been ruled by a Tutsi-dominated monarchy since the 15th century.[1][2] In 1897, Germany established a presence in Rwanda with the formation of an alliance with the king, beginning the colonial era.[3] Later, Belgium took control in 1916 during World War I. Both European nations ruled through the Rwandan king and perpetuated a pro-Tutsi policy.[citation needed]