Camel archers are marksmen wielding bows mounted on camels. They took their popularity in the Crusades, used in Arabia, Asian and Eurasian countries. Saladin, the leader of Arabia from 1174 to 1193, was known, or rather believed to use camels as a substitute for other ways of transport, such as the more common horse. Also, Darius III of Persia who ruled from 336 BC to 330 BC was known to counter Alexander the Great's attacks with camel mounted warriors. Although camel archers can be looked into deeply enough, many regions of the world who did have access to camels preferred to use the generally swifter and stronger horse archer.