treaty of Woodstock

Woodstock, treaty of, 1247. For some years the treaty of Woodstock was the high-water mark of English advance against Wales. When Dafydd ap Llywelyn died in 1246 without sons, his nephews Owain and Llywelyn ap Gruffydd made peace with Henry III. They gave up their lands east of the Conwy and agreed to hold north Wales by military service. But Henry III's struggle with his barons enabled Llywelyn to recover much of his power and in 1258 to declare himself prince of Wales.