Squire
(Fr. Écuyer, It. Scudiero, Sp. Escudero)
A member of the landed gentry generally belonging to a noble family. As the attendant on a knight, his service was also often regarded as an apprenticeship to knighthood.
In France, Écuyer (Squire) had a special and important significance. It was not a title but ranked within the nobility. A nobleman was automatically an écuyer and only a nobleman could be so styled.
On the other hand, Seigneur (Lord) was not a title and indeed even a commoner could be the owner of a lordship. The term Seigneur only meant "the possessor of a certain kind of property" in the feudal system.
Squire or esquire was also an obscure term for the pile and sometimes gyron. See also Esquire.