The Oromo Chronology 

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Oromo Kingdoms and Confederations

Date

Event

~ 300 BC Archeologists found in 1978 in northern Kenya the pillars that Oromo used in the invention of their calendar system, dated around 300 BC.
1628-46 M. de Almeida had the following to say on the traditional Oromo religion: "The Oromo are neither Christians, moors nor heathens, for they have no idols to worship." Source: "The History of High Ethiopia or Abassia"
~ 1700 In Yejju and Wallo, the Dynasties of Warra Sheika and Warra Hemanu respectively were found.
1800 Limmu, the first of the five Gibe States (Limmu, Guuma, Gomma, Geera and Jimma), was formed.
1810 Gumma, the second of the five Gibe States (Limmu, Guuma, Gomma, Geera and Jimma), was formed.
1820 Gomma, the third of the five Gibe States (Limmu, Guuma, Gomma, Geera and Jimma), was formed.
1830 Jimma, the fourth of the five Gibe States (Limmu, Guuma, Gomma, Geera and Jimma), was formed.
1860 Krapf proposed the term Ormania to designate the nationality or the country of the Oromo people.
1868 A. Plowden stated, "among republican systems, Gadaa is superior." Source: "Travels in Abyssinia and the Oromo Country"