The aristocratic clan. Basically a bunch of assholes that run stuff, noblesse oblige and all.
They like power, and it's representative on earth: money.
Their representative in the Inner Circle is only referred to as the “High Regent”. Their Justicar is called Santos, sometimes referred to as the “Lower Regent”. The public face of the clan is Prince Vincent.
The progenitor of the Clan is commonly referred to as “Ventrue”, but this is taken to be a mispronunciations, as he obviously had a much cooler name.
Some information that might or might not be true, is here.