Pedigree and achievement, [1630], of Lewis Powell of Lamphey, Pembrokeshire, in the hand of the herald George Owen, Rouge Croix, with one hundred and twenty coats of arms, all emblazoned and painted. The pedigree is traced from 'Gwilim Cantington alias Cainton' of Eglwyswrw, Pembrokeshire, and 'Gwenlhian daughter of the Lord Rees ap Griffith', both depicted at the head of the pedigree in hand coloured portraits, and also from Rhirid Flaidd, from whom Powell's grandmother was descended. A number of collateral lines are depicted, including those of the Earls of Pembroke and of Worcester and the Warren family of Trewern, Nevern.
It should be noted that various sources, including Peniarth MSS 128, 131 and 132, give Gwilim Cantington's wife as Gwladus rather than Gwenllian (see P. C. Bartrum, 'Plant yr Arglwydd Rhys', National Library of Wales Journal, 14 (1965-66), 97-104 (p. 100)). The pedigree was checked and ratified by Owen and contains a certificate of authentication granting the arms to Powell, signed by Sir Richard St George, Clarenceaux King of Arms.