The latter version is given in Baldo, Jonathan (1996). "Wars of Memory in Henry V". Shakespeare Quarterly. 47 (2): 132–59 (150). doi:10.2307/2871099. JSTOR2871099. Baldo does not mention why Dafydd ap Llewelyn was knighted.
geiriadur.ac.uk
Translated from Welsh in Geiriadur Prifysgol Cymru - the University of Wales Dictionary "cam". Retrieved 10 March 2021. (yn ôl traddodiad, unllygeidiog neu lygatraws oedd Syr Dafydd Gam (Dafydd ap Llewelyn ap Hywel Fychan))
The latter version is given in Baldo, Jonathan (1996). "Wars of Memory in Henry V". Shakespeare Quarterly. 47 (2): 132–59 (150). doi:10.2307/2871099. JSTOR2871099. Baldo does not mention why Dafydd ap Llewelyn was knighted.