Cathal, Harry and Owen Hughes
Rank 2017

The sale of Westport House in Co Mayo, ancestral home of the Marquess of Sligo and often called the most beautiful house in Ireland, to a local family led by the Hughes brothers Cathal, 65, Harry, 63, and Owen, 61, was confirmed last month. They plan to spend €50m refurbishing it. The estate is one of Ireland’s leading tourist attractions and includes a pirate adventure park. The brothers also run Mayo Workwear, a €161m distributor and manufacturer of personal protection clothing under the name Portwest Clothing, and they own Hotel Westport. Mayo had profits of €14.7m on €126m sales in 2015, showing assets of €91m.