Original sentence: The Tigray-Tigrinya are an ethnic group who live in Eritrea and the northern highlands of Ethiopia's Tigray province
Edited sentence: But dissatisfaction with is oppressive rule and rebellion against him throughout the entire Empire combined with the encroachment of Italian colonialists and his war against the Sudanese Mahdists all brought about his demise (decapitation at the hands of the Mahdists).The Bahr negus expanded his domain as far as south as the Takeze river at times, but it was generally limited to the areas north of the Mareb.The Italian colony of Eritrea was subsequently formed without any significant resistance from any nerby power, adopting the ancient border of the river Mareb yet again as a boundary between the Tigrinya speaking peoples of Eritrea and Ethiopia.The Tigray-Tigrinya are an ethnic group who live in Eritrea (where they are referred to by their language, Tigrinya) and the northern highlands of Ethiopia's Tigray province.The brief rule of Abyssinia as a united Empire by Yohannes IV, a Tigrinya speaking King native to Tembien, brought about the forceful occupation and unification of all Tigrinya speaking areas under the authority of Tigray.Tigrinya speaking peoples were divided, however by the natural border of the river Mareb since medeival times separating the region known as Mareb Mellash (meaning 'beyond Mareb' in Amharic, the language of the dominant people in Abyssinia)) which for the most part coincided with the domains of the powerful Bahr negus (later the Republic of Hamasien) to the north, and that of Tigray mekonnen to the south.Upon the Amhara-Tigrayan rivalry that enveloped Abyssinia Tigray-Mekonnen's domains was to be divided further by Amhara Kings and effectively split between the shums of Agame and Tembien respectively as well as the ecclesiocracy of Aksum