Two entries with the name Gwydre.
Gwydre
One of Arthur’s warriors who was the son of Llwydeu and Gwenabwy, daughter of Caw.
His uncle, Hueil, stabbed him, which led to a feud between Arthur and Hueil.
Source
Culhwch and Olwen | Late 11th century
Gwydre
In the Mabinogion story of Culhwch, a son of Arthur killed by the boar Twrch Trwyth at the battle of Cwm Cerwyn.
Source
Culhwch and Olwen | Late 11th century