The tale of Maelor and his three sons, Cornippyn, Crygyn and Bwba, is recorded in the late sixteenth century Welsh text "Olion Cewri Cymru..." ("The Giants of Wales and their dwellings") by Sion Dafydd Rhys (with the antiquarian spelling Maylor Gawr).
[1][2] It came to pass that Maelor was captured in the cwmwd of Cyfeiliog, about twelve miles from his own castle and was sentenced to death.
He spurred his horse onwards, leaped in one great bound over the Ystwyth river and attacked his father's captors.
[1] The other sons, Crygyn and Bwba, lived in Llanilar and Llanbadarn Fawr respectively, and murdered any man who approached their stronghold.
[1] Contemporary stories still relate to one of the more unusual residents of Penparcau village, the headless dog of King Maelor's son Cornippyn.