one if you own a horse you are the boss therefor you are the master of it :) happy horsing

Fabius was dictator appointed by the Roman Senate. He did not choose his own Master of the Horse, but instead had an enemy named Marcus Minucius appointed by the Romans.

As long as it takes for you to master the art of riding a horse.

If you mean the Horse Whisperer, he is a bit south of the docks on the fringe of the jungle.

he is the successor of head master Dumpling of the horse-hogs