Milan's name has for many centuries been recorded as Mailand, which is still the German name of the city today. It comes from the Celtic Mid-lan (meaning "in the middle of the plain") and was known as Mediolanum by the Romans.
Milan was founded by the Celts of Northern Italy around 600 BC and was conquered by the Romans around 222 BC. In the 4th century A.D., at the time of the bishop Saint Ambrose and emperor Theodosius I, the city became for a short time the capital of the Western Roman Empire.
After the Ostrogoth and Lombard periods, the city regained its importance in the 11th century and led other Italian cities in gaining semi-independence from the Holy Roman Empire. During the Plague of 1349 Milan was one of the few places in Europe that was not touched by the epidemic.
During the Renaissance Milan was ruled by dukes of the Visconti and Sforza families, who had artists like Leonardo da Vinci and Bramante at their service. After trying to conquer the rest of northern Italy in the 15th century, Milan was conquered by France, and then in the early 16th century by Spain.
In the 18th century Austria replaced Spain as Milan's overlord, but during the French Revolution and the Napoleonic Wars the city was annexed into the French satellite states of the Cisalpine Republic. After 1815 Milan was part of the Kingdom of Lombardy-Venetia, under Austrian rule: the city became one of the main centers of Italian nationalism, reclaiming independence and the unification of Italy.
In 1859 after the second of the Wars of Italian Independence Austrian rule was ended by the Kingdom of Sardinia (which transformed into the kingdom of Italy in 1861).
Being a critical industrial centre of Italy, Milan was target of continuous bombing during World War II; in 1943 Milan was part of Mussolini's puppet state Italian Social Republic and an important command centre of the German Army stationed in Italy. When war in Italy was finally over, April 25, 1945, Milan was heavily damaged and entire neighborhoods were radically destroyed. After the war the city was reconstructed and became again an important financial and industrial centre of Italy.