Cadwallon ap Einion (c. 460-517 or 534), usually known as Cadwallon Lawhir ('Long Hand') and also called Cadwallon I by some historians, was a king of Gwynedd. He was said to have been a son of Einion Yrth and Prawst ferch Deithlyn. Cadwallon's epithet, Lawhir, may possibly refer to him having longer than usual arms or might also be a metaphor, referring to the extent of his authority. The late medieval poet Iolo Goch claims that he could "reach a stone from the ground to kill a raven, without bending his back, because his arm was as long as his side to the ground."