Ychwanegiad difyr i gyfres Hanes Atgas sy'n edrych ar bobl ddrwg a gwahanol Cymru megis Caradog y Celt, Buddug, Gwrtheyrn, Mari'r Fantell Wen, Iolo Morganwg, Gerallt Gymro, Barti Ddu, Twm Siôn Cati, Madam Wen, Siôn Cwilt, William Powell, Sgweier Glanareth, Coch Bach y Bala, Wil Elis Porthmadog, Robert Crawshay, Guto Nyth Brân, a Griffith Jones Llanddowror.
