Dorrance, 73, and his Finnish wife Gundel spend much of the year living modestly in south Dublin but they also have a home in the Bahamas where she is a director of the Lyford Cay Foundations. They moved to Ireland in 1994 from America for tax reasons after obtaining Irish citizenship. Dorrance’s wealth comes from shares he inherited in the Campbell Soup Company, the American giant founded on the invention of condensed soup by his grandfather, John T Dorrance. By 1996 he had sold off all but a 2.3% stake, making more than €1.3bn. Assuming reasonable investment and growth, we place him at €2.5bn.