The Roche family dynasty initially made their money from cement, through what became CRH in the 1970s.
Toll roads and energy — mainly wind farms — later saw them prosper again, with Tom being the biggest shareholder in NTR. His wife Anne is one of the Doyle hotel family and owns 25pc of the Doyle Collection business. They have shared in more than 800m of dividends over the past decade. Son John runs the slick Cocu Kitchen restaurants on Dublin's Hatch Street and Baggot Street. Last May it emerged that he and his parents bought a site at Percy Place in Ballsbridge where they plan to develop a high-end apartment block complete with roof garden.