armiger - a nobleman entitled to bear heraldic arms

Baron - a nobleman (in various countries) of varying rank

burgrave - a nobleman ruling a German castle and surrounding grounds by hereditary right

count - a nobleman (in various countries) having rank equal to a British earl

duke - a nobleman (in various countries) of high rank

grandee - a nobleman of highest rank in Spain or Portugal

male aristocrat - a man who is an aristocrat

margrave - a German nobleman ranking above a count (corresponding in rank to a British marquess)

marquess, marquis - nobleman (in various countries) ranking above a count

mesne lord - a feudal lord who was lord to his own tenants on land held from a superior lord

milord - a term of address for an English lord

palsgrave, palatine - (Middle Ages) the lord of a palatinate who exercised sovereign powers over his lands

peer - a nobleman (duke or marquis or earl or viscount or baron) who is a member of the British peerage

sire - a title of address formerly used for a man of rank and authority

thane - a feudal lord or baron

viscount - (in various countries) a son or younger brother or a count

Don Juan - a legendary Spanish nobleman and philanderer who became the hero of many poems and plays and operas

Mortimer, Roger de Mortimer - English nobleman who deposed Edward II and was executed by Edward III (1287-1330)