Answer
The Kingdom of Makuria was a Christian Nubian kingdom that was subjugated by the Mamluk Sultanate under the rule of Baybars. The Makurians had been considered invincible by their enemies, and their defeat at the Battle of Debba marked a turning point in the region's history. The Mamluks would go on to conquer the rest of Nubia, and the region would remain under their rule for the next two centuries.