6. The Comer Brothers

Humble beginnings: The brothers Comer in the early years

It’s quite likely that Galway billionaires Brian (60) and Luke (62) Comer own the largest property portfolio of all the wealthy entrepreneurs in the Rich List.

Consisting of skyscrapers in German cities, hotels, shopping centres, office and apartment blocks, houses, and thousands of acres of land for development, it spans Ireland, the UK, Germany, and now Greece. In a long interview last year, Luke — who is based in Monaco (Brian lives on the outskirts of London) — said that the firm’s properties are worth close to €5bn, with debt less than 20pc of that. The rent roll was approaching €100m a year, he added. We are putting their wealth at a more conservative €3bn for now.