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Illubabor (Amharic: ኢሉባቦር) was a province in the south-western part of Ethiopia, along the border with Sudan. The name Illubabor is said to come from two Oromo words, "Illu" and "Abba Bor(a)". "Illu" is a name of a clan, and "Abba Bor" was the horse name of Chali Shone, who founded the ruling family of the area when it was conquered by Shewa; hence IlluAbabor means the Illu belonging to Ababor(a).
Originally, its capital city was Gore, then around 1978 the capital was moved to Metu. With the adoption of new constitution in 1995, the territory of Illubabor was divided between the Gambela, Oromia and the Southern Nations, Nationalities, and Peoples Regions of Ethiopia.