Domiselʹlus
.The son of a king, prince, knight, or lord before he has entered on the order of knighthood. Also an attendant on some abbot or nobleman. The person domiciled in your house. Hence the king’s body-guards were called his damoiseaux or damsels.
Froissart styles Richard II. le jeune damoisel Richart. Similarly Louis VII. (Le Jeune) was called the royal damsel.