The Oromo Chronology 

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Several Oromo Kingdoms and Confederations Existed Before 1853

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Tewodros

1853

Yohannes

1872

Menilek

1865

Zewditu

1909

Haile Selassie

1930

Mengistu Haile Mariam

1974

Meles Zenawi

1991

Events in Oromo History During the Reign of Yohannes

Date Event
1872 Kassa of Tigray became Emperor Yohannes, King of Zion, King of Kings of Ethiopia.  It was as the vassal of Yohannes and with his consent that Menilek set out to conquer and incorporate Oromia into the Abyssinian Empire. 
1867-1877 After 10 years of resistance, under the leadership of Abba Waatoo, the Rayya, Yejju and Wallo Oromo were defeated only by the combined forces of Yohannes from the north, Menilek from the south, and internal problems caused by the execution of Prince Amedie Ali Liban by Tewodros on Maqdala, and the subsequent deposition of the regent, Queen Warqitu.  It was only after Yohannes and Menilek had made sure of the stability of their rear that the Abyssinians were fully engaged in the conquest of the "south."  But the Rayya, Yejju and Wallo Oromo never submitted fully, revolts and uprisings continued.
May-June 1878 Wallo was, at the end, divided up between Yohannes and Menilek at a conference in Boru Meda, attended by the Abyssinian Emperor, kings and religious leaders.