Two answers required. One of these two powers constructed “the Beauteous Fortress” during a campaign in which Marshal de Boucicaut (“boo-see-COH”) aided the other. One of these empires tried to form an alliance with the Ilkhanate ruler Mahmud Ghazan to fight the other after the Battle of Bapheus. (10[1])Fighting between these two empires (10[1]-5[1])destroyed the Hexamilion wall. During an incident between these two empires, one of them refused to follow John Kantakouzenos’s orders (10[1])by continuing to settle Gallipoli. An emperor (10[1])supposedly turned to marble (10[1])after a siege between these two empires that caused the fall of the Paleologos (10[1])dynasty. (10[1])For (10[1])10 points, what two empires fought each other during the 1453 siege of Constantinople? (10[1])■END■ (10[1])