postilion

One who rides the near horse of the leaders to guide the horses drawing a coach.

A post-boy; one who rides a post-horse; a guide or forerunner.

One who rides the near horse of the leaders when four or more horses are used in a carriage or post-chaise, or who rides the near horse when one pair only is used and there is no driver on the box.

Same as postilion-basque.

One who rides and guides the first pair of horses of a coach or post chaise; also, one who rides one of the horses when one pair only is used.

A rider mounted on the near, leading horse pulling a carriage who guides the team.

someone who rides the near horse of a pair in order to guide the horses pulling a carriage (especially a carriage without a coachman)