based in what is now Flintshire. Around 70 – 75 A.D the Legionary fortress of Deva was constructed (modern-day Chester) and for the next 300 years was the home of the Twentieth Legion. Evidence of Roman occupations can be found at nearby Holt, where a tile and pottery works were constructed on the banks of the River Dee and at Ffrith where the remains of buildings have been located. In recent years evidence of Roman occupation nearer the city centre was found during the construction of the Plas Coch retail park. In 1995 further construction work on the site revealed traces of Roman field boundaries, hearths, a corn drying kiln and coins from the period c. AD150 –350. It is thought that these are the remains of a farmstead. Mercian conquest Wrexham formed part of the Romano-British Kingdom of Powys which emerged following the end of Roman rule in Britain and extended from the Cambrian mountains to the west to the modern west midlands region of England to the east. The dedication at Worthenbury to the 5th-century Bishop of Bangor St Deiniol suggests that this area was one of his outlying estates. Towards the end of the 6th century, English settlers were penetrating along the upper Trent and laying the foundations of the kingdom of Mercia, a Latinisation of the Old English Mierce meaning 'border people'. Possibly by the early 7th century some English had settled peacefully on surplus lands in the border region and gradually the line connecting Tarvin and Macefen along the river Gowy and Broxton Hills in Cheshire could have formed the dividing line between the British (Welsh) and the English during the 7th century. In 616 Aethelfrith of Northumbria defeated the combined forces of Gwynedd and Powys at the Battle of Chester and the royal Cynddylan dynasty of Powys was overthrown by the Mercians at the end of the 7th century. The English went on to dominate north-east Wales from the 8th to 10th centuries. During the 8th century, the royal house of Mercia displayed militaristic dominance and took advantage of the weakness of Powys to push their frontiers westwards. In 796 a battle between the Welsh and Mercians was fought at Rhuddlan and in the 8th century the Mercians established the earth boundaries of Wat's Dyke and Offa's Dyke between the Welsh kingdom of Powys and the English kingdom of Mercia. These boundaries pass just