DAVID I  . (d . 1203), a son of Prince Owen Gwynedd (d . 1169), came into prominence as a leader of the Welsh during the expedition of Henry II. in 1157 . In 1170 he became lord of Gwynedd (i.e. the district around Snowdon), but some regarded him as a bastard, and Gwynedd was also claimed by other members of his family . After fighting with varying fortunes he sought an ally in the English king, whom he supported during the baronial rising in 1173; then after this event he married Henry's half-sister Emma . But his enemies increased in power, and about 1194 he was driven from Wales by the partisans of his half-brother Llewelyn ab Iorwerth . The chronicler Benedictus Abbas calls David rex, and Rhuddlan castle was probably the centre of his vague authority .