Battle of Debre Abbay
The Battle of Debre Abbay, also known as the Battle of Mai Islami, was a conflict between Ras Marye of Yejju, regent of the Emperor of Ethiopia, and his rival from Tigray, Dejazmach Sabagadis of Agame. Although Ras Marye lost his life in the battle, Dejazmach Sabagadis was defeated and executed by Ras Marye's followers after surrendering.
Background
Ras Marye had inherited the mantle of regent of the Emperor of Ethiopia, and while admittedly a Christian, his Oromo ancestry caused much resentment from the other Christian aristocrats and nobles of Ethiopia. Irob warlord and ruler of Tigray, dejazmach Sabagadis Woldu attempted to exploit this antipathy. They succeeded in forming a coalition with his fellow Christian lords of Gojjam, Lasta and Semien against Ras Marye. Wube then married Dinqinesh, the daughter of Dejazmach Sabgadis, to foster an alliance against Yimam's successor, Ras Marye Gugsa.In 1830 however, Ras Marye invaded Semien, and Sabagadis broke his oath by not coming to Wube's aid, thus leaving Semien to be ravaged by conflict. Subagadis watched the battle on the border of Lasta, and subsequently did not come to the aid of Wube. In a dramatic shift of alliances, Wube sided with Marye against Sabagadis; in turn Sabagadis invaded Semien with his forces and drove Wube out of his fortresses of ‘‘Amba Tazzan’’ and ‘‘Amba Hay’’. Sabagadis recognized Wube's half brother and rival Merso Haile Maryam as the governor of Semien before his return to Tigray.