Eight-year-old Eoin McCormack, who cycled a marathon for charity, has raised more than €65,000 for St Luke's Centre in Beaumont Hospital and the Irish Cancer Society.
Eoin, who was supposed to make his First Holy Communion, completed his marathon cycle in three hours and ten minutes.
He set up the fundraiser to raise funds for the charities that helped his grandfather during his cancer treatment.
Eoin’s GoFundMe started six days ago, and the initial target was €500.
It was over €7,000 when a piece about his charity cycle was published by RTÉ News yesterday.
It now stands at over €65,000, after a €50,000 donation from UFC fighter Conor McGregor, who was said to be pleased to be one of Eoin's many supporters.
Speaking after his cycle, Eoin said he was "feeling good" and "wasn't too tired".
Eoin's grandfather Des said: "He is just so thoughtful. It's 26 miles on a bike for an eight-year-old. It's something he will always remember."