Columbia subject headings:
Harvard subject headings:
Courtly love in literature.
Dafydd ap Gwilym, active 14th century--Criticism and interpretation.
Influence (Literary, artistic, etc.)
Love poetry, Welsh--History and criticism.
Nature in literature.
Originality in literature
Wales--In literature.
Welsh poetry--1100-1400--History and criticism.
Princeton subject headings:
Dafydd ap Gwilym, active 14th century--Criticism and interpretation.