Oromo expansion

16–17th century northerly expansions of Oromo people

The Oromo expansions or the Oromo invasions (in older historiography, Galla invasions), were a series of expansions and conquests in the 16th and 17th centuries by the Oromo primarily documented by the Gamo monk Bahrey, but also mentioned in other Christian, Muslim and Portuguese records. Prior to their great expansion in the 16th century, the Oromo inhabited only the area of what is now modern-day southern Ethiopia and northern Kenya. Over the centuries, many factors – mostly the wars between the Adal Sultanate and the Ethiopian Empire – would further encourage the numerous Oromo pastoralist tribes to expand towards what is now central and eastern Ethiopia.

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