The "Wallo" and "Yejju" clans of the Oromo people rise to power culminated in 1755, when Emperor Iyoas I ascended to the imperial throne in Gondar. They would be one of the major factions contending for imperial power during the ensuing Zemene Mesafint, starting from 1769, when Mikael Sehul, Ras of Tigray killed Iyoas I and replaced him with Yohannes II.