Wigan /ˈwɪɡən/ is a town in Greater Manchester, England. It stands on the River Douglas, 7.9 miles (13 km) south-west of Bolton, 10 miles (16 km) north of Warrington and 16 miles (25.7 km) west-northwest of Manchester. Wigan is the largest settlement in the Metropolitan Borough of Wigan and is its administrative centre. The town of Wigan had a total population of 97,000 in 2011, whilst the wider borough has a population of 318,100. Historically in the county of Lancashire, Wigan during classical antiquity was in the territory of the Brigantes, an ancient Celtic tribe that ruled much of northern England. The Brigantes were subjugated in the Roman conquest of Britain during the 1st century, and it is asserted that the Roman settlement of Coccium was established where Wigan lies. Wigan is believed to have been incorporated as a borough in 1246 following the issue of a charter by King Henry III of England. At the end of the Middle Ages it was one of four boroughs in Lancashire possessing Royal charters; the others were Lancaster, Liverpool, and Preston.