The poem "The Rattle Bag" by the Welsh poet Dafydd ap Gwilym (1315–1350 or 1340–1370) has many elements that suggest that it was written as a reflection of the hardships he endured during the Black Death.
In May 2012 Patrick completed a song cycle in Welsh for Elin Manahan Thomas based on the poems of 13th century Welsh poet Dafydd ap Gwilym.
Robert Gwilym | Gwilym Tew | Eurfyl ap Gwilym | Dafydd Iwan | Dafydd ap Gwilym | Llywelyn ap Dafydd | Gwladys ferch Dafydd Gam | Gwilym Simcock | David Pugh and Dafydd Rogers | Dafydd Williams | Dafydd Wigley | Dafydd Goch | Dafydd Gam | Dafydd Elis-Thomas | Dafydd Davis | Dafydd ab Owain Gwynedd | Dafydd ab Hugh | Dafydd ab Edmwnd |
He has contributed many learned articles on late medieval Welsh poetry, including the work of Dafydd ap Gwilym, although his main interest was the life and work of poet Gruffudd Hiraethog (d. 1564).