Limerick brothers Patrick and John Collison have made it on to the Forbes rich list for the first time.
The brothers each have wealth valued at €1.02bn, which they have accrued through their online payments system Stripe, putting them joint 1,795th on the list.
Younger brother John (26) is the youngest self-made billionaire to appear of the list, ahead of Snapchat founders Evan Spiegal and Bobby Murphy.
In total, there were eight Irish people named on the list.
Indian-Irish businessman Pallonji Mistry was ranked in 77th place overall with an estimated wealth of €13.3bn. Businessman and Digicel founder Denis O' Brien - the largest shareholder in Independent News and Media - also makes it on the list in 348th place with a fortune of €4.3bn.
Other Irish names on the list were John Grayken (€6.1bn), Campbell Soup heir John Dorrance (€2.5bn), Dermot Desmond (€1.8bn) and Martin Naughton (€1.6bn).
Bill Gates was the world's richest man with a personal fortune worth €80bn.
Warren Buffet was in second place with €75bn, while Amazon's Jeff Bezos was third with wealth of €67.8bn.
Spanish clothing tycoon Amancio Ortega was fourth with €66.4bn, while Facebook founder Mark Zuckerburg was fifth richest with a total wealth of €52bn.
Few 25-year-olds from Limerick can claim to be pals with Elon Musk, the enigmatic Tesla founder, or to have raised almost $300m in venture capital. But John Collison, co-founder of payments start-up Stripe, has paid the price for his early success. “I’ve already gone grey,” he says, pointing at his salt-and-pepper hair.