The only certain historical knowledge about the bandits is that they murdered the Sheriff of Meirionnydd, the Baron Lewis ap Owen, of Cwrt Plas-yn-dre, Dolgellau on 12 October 1555. The attack was carried out by a group of bandits in Dugoed Mawddwy, near Dinas Mawddwy.
The only definite historical information about the outlaws is that they assassinated the Sheriff of Meirionnydd, Baron Lewis ap Owen, of Cwrt Plas-yn-dre, Dolgellau on 12 October 1555. The attack was carried out by a group of robbers in Dugoed Mawddwy, near Dinas Mawddwy.