A valet or varlet is a male servant who serves as personal attendant to his employer. In the Middle Ages and Ancien Régime, valet de chambre was a role for junior courtiers and specialists such as art
A 17th-century valet de chambre
Carving of "Bazin", the valet to Aramis, of The Three Musketeers, was a studious person who later became a lay brother. (Thomas Nicholls carves him brushing his master's clothes whilst studying theology.)
A batman or orderly is a soldier or airman assigned to a commissioned officer as a personal servant. Before the advent of motorized transport, an officer's batman was also in charge of the officer's "
Valet
…sons before they had a valet of their own, or for male guests who did not travel with a valet. Others started out as soldier-servants to army officers (batmen) or stewards to naval officers. Traditionally, a valet did much more than merely lay out clothes and take care of personal items. He was also responsible…
French aide-de-camp, Napoleonic Wars.
Batman (military) (1802–1812)
Field Marshal Bernard Montgomery with his batman, Corporal English, in 1943