Llanrwst is a small town

Town

A town is a human settlement larger than a village but smaller than a city. The size a settlement must be in order to be called a "town" varies considerably in different parts of the world, so that, for example, many American "small towns" seem to British people to be no more than villages, while...

 and community

Community (Wales)

A community is a division of land in Wales that forms the lowest-tier of local government in Wales. Welsh communities are analogous to civil parishes in England....

 on the A470 road

A470 road

The A470 is a major long-distance connective spine road in Wales, running from Cardiff on the south coast to Llandudno on the north coast. It covers approximately 186 miles , over a zig-zagging route through the entirety of the country's mountainous central region, including the Brecon Beacons and...

 and the River Conwy

River Conwy

The River Conwy is a river in north Wales. From its source to its discharge in Conwy Bay it is a little over long. "Conwy" is sometimes Anglicized as "Conway."...

 in Conwy County Borough, Wales

Wales

Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...

. It takes its name from the 5th century to 6th century Saint Grwst

Saint Grwst

Saint Grwst the Confessor was a 6th and 7th century saint operating in the Welsh Kingdom of Gwynedd.-Family:...

, and the original parish church

Parish church

A parish church , in Christianity, is the church which acts as the religious centre of a parish, the basic administrative unit of episcopal churches....

 in Cae Llan was replaced by the 12th-century church.

The growth of the town in the 13th century was considerably aided by an edict by Edward I of England

Edward I of England

Edward I , also known as Edward Longshanks and the Hammer of the Scots, was King of England from 1272 to 1307. The first son of Henry III, Edward was involved early in the political intrigues of his father's reign, which included an outright rebellion by the English barons...

, who built Conwy Castle

Conwy Castle

Conwy Castle is a castle in Conwy, on the north coast of Wales.It was built between 1283 and 1289 during King Edward I's second campaign in North Wales....

, prohibiting any Welshman from trading within 10 miles (16.1 km) of that town.