Sir Tom Hunter, Scotland's richest man, is pledging to give away at least £1bn to charity, the BBC has learned.
The donation is thought to be the single most generous philanthropic commitment made by a Briton. He had already committed £100m to his charitable foundation to fight inequality in both Scotland and Africa.
The ex-owner of sports chain Sports Division has a £1.05bn fortune. He began his career by selling trainers from the back of a van and in 1984 founded the Sports Division chain.
He said: "There is more great wealth in fewer hands than ever before in history. My own personal belief is that with great wealth comes great responsibility. We've got all the material, goals have all been settled some time ago. So now the philanthropy is the real motivator to continue to make money."