merchant prince

noun2

1. •
   (figurative) A prince among merchants: a wealthy and influential merchant.
2. •
   (figurative) A mercantile plutocrat: a man who wields great de facto political power by virtue of economic assets derived from trade and commerce.

   • ...you’re establishing a plutocracy. You’re making us a land of traders and merchant princes. Then what of the future? — 1951