West Belfast native Paddy McKillen (63) got into the property game in the 1980s after leaving school at 16 to work in his family's exhaust repair business. He has a multinational property empire. His son Paddy Jnr is almost single-handedly taking over Dublin's pub, restaurant and hotel scene, while sons Dean and Tyrone build and sell mansions for the super-rich in the US - the apples didn't fall far from the tree in this household.
After a protracted battle with the billionaire Barclay brothers, he sold a 36pc stake in three of London's most expensive hotels to the Qatari royal family, but continues to receive a Â£5m-a-year fee for helping to manage them. He has a 50pc interest in Dublin-focused Clarendon Properties, which alone owns over €500m of assets in Dublin, Cork, London and Boston. Separately, his own holding company has more than 60 properties. There are other interests in Belfast, Limerick and the north of England through joint ventures. An avid art collector, he keeps various works in a boutique hotel near Aix-en-Provence in southern France, which sits among 600 acres of woodlands and vineyards. He backed a controversial design for a U2 visitor centre in Dublin's Docklands, while Bono has backed a whiskey distillery he's planning in Kildare.
McKillen also works with fellow Rich Lister Johnny Ronan on various development schemes in Dublin, and together they own a stake in the city's Treasury Building.