Roman forces took control of most of what became the Roman province of Britannia Superior in 43 AD but then took a further 25 years to gain control of the present day South Wales valleys. Roman control remained established until full scale withdrawal in the 5th century AD when the Kingdoms of Gwent and Glywysing were established. Gwent was defined as the land between the River Usk and the River Wye and Glywysing, the land between the River Usk and the River Tawe. Cwmcarn, located where the Carn and Ebbw river valleys meet, being situated within the Welsh Kingdom of Glywysing.