Divorced two years ago, recently helped fund his girlfriend Dasha Zhukova's art gallery.

FORBES: In Pictures: The 2009 Billionaire List

Roman Abramovich, owner of Chelsea football club, and his partner Dasha Zhukova have used Mollie Dent-Brocklehurst, whose family inhabits 15th-century Sudeley Castle in Gloucestershire, as an art adviser.

ECONOMIST: Assimilating plutocrats