Warriors, Knights, and Horses Shahnameh. (The Book of Kings) Abolqasem Ferdowsi (932-1025CE)
Rostam and Rakhsh Rostam does Battle with a dragon. Notice the role of Rakhsh, his horse, in the battle.
Other Sources
The entire text, as well as some background information.
Some other scenes from the epic.
The Princeton Shahnameh Project