City (pop., 2000 est: city, 128,600; metro. area, 317,300), capital of Switzerland. Lying along a loop of the Aare River, it was founded as a military post in 1191 by Berthold V, duke of Zähringen. It became a free imperial city in 1218. Gradually extending its power, it became an independent state, and in 1353 it entered the Swiss Confederation. It was a scene of disputation in 1528 between Roman Catholics and reformers, which led to its subsequent championing of Protestant doctrines. It became a member of the Helvetic Republic and in 1848 was made the capital of Switzerland. It is headquarters of the international postal, railway, and copyright unions.