is the capital of the Lombardy region, and the most populous metropolitan area and the second most populous comune in Italy.The population of the city proper is 1.3 million, while its urban area (that stretches beyond the boundaries of its metropolitan province), with a population estimated to be about 5.5 million, Milan is the main industrial and financial centre of Italy and one of global significance.
Its business district hosts Italy's Stock Exchange and the headquarters of the largest national and international banks and companies.
The city is a major world fashion and design capital, well known for several international events and fairs, including Milan Fashion Week and the Milan Furniture Fair.
Milan's museums, theatres and landmarks (including the Milan Cathedral, Sforza Castle and Leonardo da Vinci paintings such as The Last Supper, a UNESCO World Heritage Site) attract over 9 million visitors annually..
However, some scholars believe lanum comes from the Celtic root lan, meaning an enclosure or demarcated territory (source of the Welsh word 'llan', meaning a sanctuary or church) in which Celtic communities used to build shrines.
Hence, Mediolanum could signify the central town or sanctuary of a Celtic tribe.
Indeed, the name "Mediolanum" is borne by about sixty Gallo-Roman sites in France, e.g.Saintes (Mediolanum Santonum) and Évreux (Mediolanum Aulercorum).In addition, another theory links the name to the boar sow (the Scrofa semilanuta) an ancient emblem of the city, fancifully accounted for in Andrea Alciato's Emblemata (1584), beneath a woodcut of the first raising of the city walls, where a boar is seen lifted from the excavation, and the etymology of Mediolanum given as "half-wool", In 222 BC, the Romans conquered the settlement, renaming it Mediolanum.Milan was eventually declared the capital of the Western Roman Empire by Emperor Diocletian in 286 AD.Diocletian chose to stay in the Eastern Roman Empire (capital Nicomedia) and his colleague Maximianus ruled the Western one.Immediately Maximian built several monuments, such as a large circus 470 m × 85 m (1,542 ft × 279 ft), the Thermae Herculeae, a large complex of imperial palaces and several other buildings.