The Oromo, sometimes called Galla (this usage has now become pejorative, but was widely used into the 20th century) are an indigenous African ethnic group found in Ethiopia and to a lesser extent Kenya. They are the largest single ethnic group in Ethiopia, at 32.1% of the population according to the 1994 census, and today numbering around 24 million.Ethiopia: A Model Nation of Minorities (accessed 26 March 2006) Their native language is the Oromo language, or Afan Oromo.
While further research is needed to comprehend the origin of Oromo people, it is well known that Oromo people come from a line of pastoralist/nomadic group. It is more likely they have existed for a longer period of time side by side with their northern Semitic-speaking neighbors. There is a wealth of oral history that describe interactions between the two group dating back as early as the 6th century. The Oromo mostly settled in the southern areas of Ethiopia. Their settlement patterns also sometimes separated Christian Amharic-speaking groups from each other.
During the 16th century, following the wars between the kingdom of Ethiopia and the neighbouring Sultanate of Adal, which resulted in the exhaustion of both countries the Oromos moved north into their territories. The Ethiopian monk Bahrey, writing in 1593, attributed the Oromo success to the existence of too many non-fighting classes in the ruling Ethiopian heirarchy, as opposed to the Oromos, whom he described as having a homogenous warrior class.Bahrey, "History of the Galla" (1593). Translated by C.F. Beckingham and G.W.B. Huntingford in Some Records of Ethiopia 1593-1646 (London: The Hakluyt Society, 1954). This is the earliest known account of the Oromo. Bahrey also explained their migrations into northwestern areas such as Arsi, Shewa, Welega, and Gojjam and northeastern areas like Hararghe and Wollo as result of their inhospitable homeland.Marcus, Harold G. A History of Ethiopia. (University of California Press, updated edition: 2002), pp. 37. ISBN 0520224795 Harold G. Marcus suggests northwest Borena as the original homeland of the Oromo.Marcus, A History of Ethiopia, p. 35.
Settled Oromo started to integrate with their Amharic-speaking neighbors at least from the 18th century. Also, several Oromo chieftains obtained power in government of the monarchy. Particularly Emperor Iyoas I (1730-55) favored his mother's Oromo kinsmen and allies, and in his era, the Oromo language was the language of the court in Gondar.
This era, known in Ethiopia as the Zemene Mesafint, the Oromo dynasty of chiefs of Yejju were the most important continuous line of warlords to dominate the figurehead emperors of Ethiopia. They became sub-kings of Begemder, Enderases (Regents) of the empire, as well as imperial father-in-laws. Ras Ali I of Yejju achieved this dominance in 1779, and it continued, although contested by other warlords, until the 1855 defeat of Ras Ali II of Yejju by the upstart emperor Tewodros II. Due to the powerlessness of the Emperor of Ethiopia during this period, the Yejju Oromo were effectively the rulers of Ethiopia.
Other tribes and chiefs of the Oromo people were also prominent, such as lady Menen of Wollo who became Empress in 1800's; Ras Mohammad of Wollo who became Ras Mikael, later Negus of Sion and father of an emperor; and another lady Menen, of Ambassel, who became Empress consort of Haile Selassie.
In order to integrate with the imperial power and family, a large share of the Oromo converted to christianity during these centuries. As one of the last such developments, in late 1800's Emperor Yohannes IV ordered the Oromo tribe of Wollo to convert to christianity within six months at the threat of losing their property. Their leader Mohammed became lord Mikael and later made an imperial marriage, becoming the father of Emperor Iyasu V.
Oromo society was traditionally structured in accordance with gadaa, a social stratification system partially based on an eight-year cycle of age sets, but over the centuries the age sets grew out-of-alignment with the actual ages of their members, and some time in the 1800s another age set system was instituted. Under gadaa, every eight years the Oromo would hold a popular assembly called the Gumi Gayo, at which laws were established for the following eight years. A democratically elected leader, the Abba Gada, presided over the system for an eight-year term. Gadaa is no longer in wide practice but remains influential.
Several of these groups seek to create an independent Oromo nation, some using armed force. This proposed nation would share its name and borders with the current Ethiopian region of Oromia where the majority of Oromo people live.
The Galla who call themselves Oromo, are as uncertain about the origin of their name as are the anthropologists. Orma means a foreigner who is not a relative; galĂ means a stranger who is a guest, galla is a stranger who joins a tribe; gala, an imperative, means 'go home'; gala a noun, means one who goes home, also provisions for travelling. The Galla language gives us no further hint. The history of the people is indeed a tale of nomadic strangers & guests who are seeking a home. Now they have found that home but they are still designated as guests (Jaenen 1956:172).Baxter, et al., Being and Becoming Oromo, p.106.