"Goodwick Moor. Here Rhys, son of Owain ap Edwyn, was defeated and slain in 1074 by Trahaearn ap Caradog (Brut y Tywysogion). The moor is now waterlogged and marshy. Visited, 2nd June 1921." [The 'Brut' gives a date of 1078, see below]
Source: RCAHMW Pembrokeshire Inventory, 1925, ii, no.591.
1078: "And then there was the battle of Pwllgwdig. And then Trahaearn, king of Gwynedd, prevailed. And then all Rhys [ap Owain]'s warband fell." Source: Thomas Jones, The Chronicle of the Princes, 1955, p.29.
"In 1078 Trahaearn of North Wales invaded Dyfed, defeated Rhys [ab Owain] in the battle of Goodwick, not far from Fishguard . . ."
In a footnote the battle is referred to as 'urwydyr Llan wnda' (battle at Llanwnda).
Source: J.E.Lloyd, A History of Wales, vol II, 1912, p.377; p.393 & n.114.
B.A.Malaws, RCAHMW, 27 October 2006.