to have been the Mareb River, which is currently constitutes the border between the Ethiopian province of Tigray and Eritrea.

After the loss of power of the Bahr negus in the aftermath of Bahr negus Yeshaq's rebellions, By the unsettled Zemene Mesafint period ("Era of the Princes"), both designations had declined to little more than empty titles, and the lord who succeeded them used (and received from the Emperor)