Chester (/ˈtʃɛstər/ CHESS-tər) is a walled city in Cheshire, England. Lying on the River Dee, close to the border with Wales, it is the largest and most populous settlement of the unitary authority area of Cheshire West and Chester, which had a combined population of 328,100 according to the 2001 Census, increasing to 329,608 at the 2011 Census. Chester was granted city status in 1541.Chester was founded as a 'castrum' or Roman fort with the name Deva Victrix, during the reign of the Emperor Vespasian in AD79. One of the three main army camps in the Roman province of Britannia, Deva later became a major civilian settlement. In 689, King Æthelred of Mercia founded the Minster Church of West Mercia, which later became Chester's first cathedral, and the Saxons extended and strengthened the walls, much of which remain, to protect the city against the Danes. Chester was one of the last cities in England to fall to the Normans. William the Conqueror ordered the construction of a castle, to dominate the town and the nearby Welsh border.Chester is one of the best preserved walled cities in Britain. It has a number of medieval buildings, but some of the black-and-white buildings within the city centre are Victorian restorations. Apart from a 100-metre (330 ft) section, the listed Grade I walls are almost complete. The Industrial Revolution brought railways, canals, and new roads to the city, which saw substantial expansion and development – Chester Town Hall and the Grosvenor Museum are examples of Victorian architecture from this period.