This study of the poetry of Siams Dwnn, son of the heraldic bard Lewys Dwnn contains a wealth of new material relating to the gentry of Montgomeryshire in particular during the first half of the 17th century - many of their houses are depicted in a series of photographs, prints, and pictures. The significance of the Battle of Montgomery (1644) is also discussed in an Appendix. Atgynhyrchir rhifau 3, 6, 7, 8, 9, 10, 17, 19, 21, 23, 27, 33, 36, 37, 38, 39, 40, 41, 42, 43, 44, 51, 56, 57, drwy ganiatad Llyfrgell Genedlaethol Cymru; rhifau 4, 16, 30, 34, 35, 49, 50, 52, 53, 55, drwy ganiatad Comisiwn Brenhinol Henebion Cymru - Hawlfraint y Goron; rhif 28 drwy ganiatad The Public Record Office, Llundain; rhif 47 drwy ganiatad Arwel a Delyth Jones, Rhyd-y-gro, Llanerfyl. (Mr. David Thomas o"r Comisiwn a luniodd y Map.) Lluniau a dynnwyd gan yr awdur yw"r gweddill. Carwn gydnabod yma hefyd y cymorth a gefais gan Miss Rhian Edwards wrth olygu rhai o"r lluniau hyn.