Note:  Do not rely on this information. It is very old.

Marquis

Marquis, Marquess, a title of nobility, originally a governor of a frontier or march, now a nobleman next in rank below a duke (whose eldest sons generally bear the title by courtesy), and above an earl or count. The first titular marquis in England was created in 1387 - namely, Robert de Yere, Earl of Oxford, Marquis of Dublin.