Paris is the capital and most-populous city of France. Situated on the Seine River, in the north of the country, it is in the centre of the Île-de-France region, also known as the région parisienne, "Paris Region". The City of Paris has an area of 105.4 square kilometres and had a population of 2,241,346 within its city limits in 2014. The Paris Region covers 12,012 square kilometres, and has its own regional council and president. It had a population of 12,005,077 as of January 2014, or 18.2 percent of the population of France.Paris was founded in the 3rd century BC by a Celtic people called the Parisii, who gave the city its name. By the 12th century, Paris was the largest city in the western world, a prosperous trading centre, and the home of the University of Paris, one of the first in Europe. In the 18th century, it was the centre stage for the French Revolution, and became an important centre of finance, commerce, fashion, science, and the arts, a position it still retains today.The Paris Region had a GDP of €624 billion in 2012, accounting for 30.0 percent of the GDP of France, and ranking it as one of the wealthiest five regions in Europe; it is the banking and financial centre of France, and contains the headquarters of 29 of the 31 companies in France ranked in the 2015 Fortune Global 500.