magnate

A powerful or influential person, especially in business or industry.

A person of rank; a noble or grandee; a person of note or distinction in any sphere.

Specifically.

One of the members of the upper house of the Diet of Hungary, called the House (or Table) of Magnates. It comprises certain hereditary peers, high state dignitaries and ecclesiastics, life peers, etc.

A person of rank; a noble or grandee; a person of influence or distinction in any sphere; -- used mostly of prominent business executives.