An unpublished treatise entitled 'Llefr o'r Eglwys Crhistnogedd/yrhwn sy'n dangos cyflwr, neu staat/Eglwys dduw, o flaen y ddeddyf, tann y ddeddyf, ie a thann yr/Efengil: gan ddatcuddio hefyt/Cynnyddiat Tyrnas y Rufainol/Anticrhist, aei Ceremoniae mution/aei ddechmygion Coegion: hyd oni/ddoeth ef yw eisteddfa vchaf, ymavn/y mae e ef heddiw yn tyrnassv./yn y diwedd yw/wradwyddiat ei hvn./Yrhwn Lefr a wnaed trwy/Rowland Puleston Año 1583'.
A collection, accumulated by the Lloyd family of Plas Power, comprising an unpublished sixteenth-century treatise; annotated copies of works by Moses Williams (1685-1742) and John Worrall (d. 1771); an English-Welsh dictionary and material for a Welsh dictionary; transcripts of Welsh poetry, of an essay by Robert Vaughan of Hengwrt (1592?-1666), and of George Ripley's (d. c. 1490) 'The compound of alchymy', 1471; treatises, vocabularies and other texts in Latin and Greek; genealogies of Welsh families; sixteenth-century rental accounts relating to North Wales; an account of proceedings in Parliament for the year 1620; a translation of Christopher Sutton's (c. 1565-1629) Disce mori ...; a version of Piers Plowman; and other items.
