 The Oromo people are the largest ethnic group in Ethiopia, also found in northern Kenya and Somalia, with an estimated total population of over 35 million.Like other ethnic groups in the Horn of Africa and East Africa, Oromo people regionally developed social stratification consisting of four hierarchical strata.The highest strata were the nobles called the "Borana", below them were the "Gabbaro" (some 17th to 19th century Ethiopian texts refer them as the "dhalatta").