magus

Walking alongside his apprentice__ horse, Sethil Longmere, magus of the Third Circle, Magi Master of Dormir__ army, and a man who had seen more years than most men could count, did his best to keep his apprentice Rousche from falling off his gelding. The dun horse had a sure foot and a good temper, but it seemed unlikely the animal was used to a grown man lying face first in its mane, legs sprawled behind, dangling with each step.

I have been wrong and Simon Magus has been right.