Exeter is a cathedral city in Devon, England with a population of 124,328 (mid-2014 est.). It lies within the ceremonial county of Devon, of which it is the county town as well as the home of Devon County Council. Exeter was the most south-westerly Roman fortified settlement in Britain, although there is evidence a Cornish tribe existed in Exeter before the Roman invasion. Exeter became a religious centre during the Middle Ages and into the Tudor times. Exeter became an affluent centre for the wool trade, although by the First World War the city was in decline. After the Second World War, much of the city centre was rebuilt and is now considered to be a centre for modern business and tourism in Devon and Cornwall. Exeter has mild wet winters and warm changeable summers with hot and cooler rainy spells. Temperatures do not vary much throughout the year.