A man of elevated rank or station; a nobleman. In Spain, a nobleman of the first rank, who may be covered in the king's presence.

A person of eminence or high rank.

a nobleman of highest rank in Spain or Portugal

Grandee is a word either to render in English the Spanish high aristocratic title Grande, or by analogy to refer to other people of a somewhat comparable, exalted position, roughly synonymous with Magnate, and in particular by analogy to a formal upper level of the nobility, such as a peerage (especially if granted parliamentary seats).