The 3 leaps are three stones in a field next to the georgian mansion called Plas Gwyn. They were placed there in remembrance of a competition between two men for the hand in marriage of St Geraint’s grand=daughter, supposedly in the 6th century. By adopting a triple-jump style approach, Hywel ap Gwalchmai was able to beat his opponent and get his girl.
(can’t remember where I read this – possibly in LV Grinsell’s collection, ‘Folklore of Prehistoric Sites in Britain’ 1976.)