Marcher lord in the context of "Conquest of Wales by Edward I"

The England–Wales border, sometimes referred to as the Wales–England border or the Anglo-Welsh border, runs for 160 miles (260 km) from the Dee estuary, in the north, to the Severn estuary in the south, separating England and Wales.

It has followed broadly the same line since the 8th century, and in part that of Offa's Dyke; the modern boundary was fixed in 1536, when the former marcher lordships which occupied the border area were abolished and new county boundaries were created. The administrative boundary of Wales was confirmed in the Local Government Act 1972. Whether Monmouthshire was part of Wales, or an English county treated for most purposes as though it were Welsh, was also settled by the 1972 Act, which included it in Wales.

Roger Mortimer, 3rd Baron Mortimer of Wigmore, 1st Earl of March (25 April 1287 – 29 November 1330), was an English nobleman and powerful marcher lord who gained many estates in the Welsh Marches and Ireland following his advantageous marriage to the wealthy heiress Joan de Geneville, 2nd Baroness Geneville. Her mother was of the royal House of Lusignan. In November 1316, he was appointed Lord Lieutenant of Ireland. He was imprisoned in the Tower of London in 1322 for having led the marcher lords in a revolt against King Edward II in what became known as the Despenser War.

He later escaped to France, where he was joined by Edward's queen consort Isabella, where they had an affair. After he and Isabella led a successful invasion and rebellion, Edward was deposed; Mortimer allegedly arranged his murder at Berkeley Castle. For three years, Mortimer was de facto ruler of England before being himself overthrown by Edward's eldest son, Edward III. Accused of assuming royal power and other crimes, Mortimer was executed by hanging at Tyburn.

The Welsh Marches (Welsh: Y Mers) is an imprecisely defined area along the border between England and Wales in the United Kingdom. The precise meaning of the term has varied at different periods.

The English term Welsh March (in Medieval Latin Marchia Walliae) was originally used in the Middle Ages to denote the marches between England and the Principality of Wales, in which Marcher lords had specific rights, exercised to some extent independently of the king of England. In modern usage, "the Marches" is often used to describe those English counties which lie along the border with Wales, particularly Shropshire and Herefordshire, and sometimes adjoining areas of Wales. However, at one time the Marches included all of the historic counties of Cheshire, Shropshire, Herefordshire, Worcestershire and Gloucestershire.

Chepstow (Welsh: Cas-gwent) is a town and community in Monmouthshire, Wales, adjoining the border with Gloucestershire, England. It is located on the tidal River Wye, about 2 miles (3 km) above its confluence with the River Severn, and adjoining the western end of the Severn Bridge. It is the easternmost settlement in Wales, situated 16 miles (26 km) east of Newport, 28 miles (45 km) east-northeast of Cardiff, 18 miles (29 km) northwest of Bristol and 110 miles (180 km) west of London.

Chepstow Castle, situated on a clifftop above the Wye and the old bridge, is often cited as the oldest surviving stone castle in Britain. The castle was established by William FitzOsbern immediately after the Norman Conquest, and was extended in later centuries before becoming ruined after the Civil War. A Benedictine priory was also established within the walled town, which was the centre of the Marcher lordship of Striguil. The port of Chepstow became noted in the Middle Ages for its imports of wine, and also became a major centre for the export of timber and bark, from nearby woodland in the Wye Valley and Forest of Dean. In the late eighteenth century the town was a focus of early tourism as part of the "Wye Tour", and the tourist industry remains important. Other important industries included shipbuilding – one of the First World War National Shipyards was established in the town – and heavy engineering, including the prefabrication of bridges and wind turbine towers. Chepstow is also well known for its racecourse, which has hosted the Welsh National each year since 1949.