Those numbers are no doubt exaggerated as well as imprecise, for they may or may not include the fortunes amassed by extended families and a more or less extensive network of cronies.
Only as recently as 2012, O'Reilly was reported to be worth around €1bn, not including the multimillion-euro fortune of his second wife, the Greek shipping heiress Chryss Goulandris.
Lisa writes for a variety of publications, including the Huffington Post, Asian Fortune and ExpertBeacon.
Its partners include the China Gas Group, Fortune Oil's venture with China Gas's former managing director, Liu Ming Hui, and Fortune Max Holdings, controlled by Fortune Oil's vice chairman, Daniel Chiu.
It involves more than 400 trade associations and companies, including half the Fortune 100, and is being coordinated by the Business Industry Political Action Committee, or Bipac.
Last week, Fortune Group, a unit of Time Warner, announced a plan to open two exchange-traded funds later this year, including one, the Fortune e-50 Index Tracking Stock, that will mirror Fortune's new "e-50" Internet index.
His work during the past decade has included global M&A and restructuring projects with 30percentt of the Fortune 100, including the three largest financial services integrations of 2008 to 2009.
Sarah became one of the trustees of the Marlborough estate, and she used her business sense to distribute the family fortune, including the income for her daughter Henrietta.
Finance underlies some of the biggest, and oldest, fortunes, including the $8.5 billion one belonging to the nation's wealthiest person, Tsai Hong-tu, chairman of Cathay Financial Holdings, and his family.
