Llywelyn ap Gruffydd Fychan of Caeo (c. 1341 – 9 October 1401) was a Welsh landowner, a squire in effect, who in 1401 organized a decoy of Henry IV's English forces searching for the Welsh resistance leader Owain Glyndŵr. The deception allowed Owain to escape but involved Llywelyn in putting his life on the line. As punishment for his actions, Llywelyn was condemned by the English king to be executed in the town square of Llandovery.