[1][2] After his reconquest of Adal, Sabr ad-Din III died of natural causes in 1422, Sultan Mansur succeeded the throne and enjoyed support of his brother Muhammad.
Early in his reign he launched an expedition against an Ethiopian Christian monarch, Emperor Dawit I and drove him to Yedaya which was described as his royal seat, destroyed the Solomonic army, where according to Maqrizi, Dawit was captured and killed.
His death however presumed to be an event of major importance, is not recorded by the Ethiopian Chronicles.
[3][4] Mansur later made his way towards to the Moha mountains where he surrounded a considerable imperial force of 30,000 soldiers.
In 1424 another Christian monarch, Emperor Yeshaq I, set forth with a huge army which Maqrizi likens to a swarm of locusts, the christian troops were also trained by fugitive Mamluk which taught them the secrets of Greek fire.