Pitești (piˈteʃtj) is a city in Romania, located on the river Argeș. The capital and largest city of Argeș County, it is an important commercial and industrial center, as well as the home of two universities. Pitești is situated in the historical region of Muntenia. It lies on the A1 freeway connecting the city directly to the national capital Bucharest, being an important railway junction, with a classification yard in nearby Bălilești. The city houses the Arpechim oil refinery, and is a marketing center for the automotive industry, in particular, Automobile Dacia. Inhabited since prehistoric times but first mentioned in the 14th century, it developed as a trading town in northern Wallachia, serving as an informal residence for various Wallachian Princes until the 18th century. From the 19th century and until the interwar period, it was an important political center for the National Liberal Party and the main residence of the Brătianu family of politicians. During the early stages of the communist regime, it was one of the main sites of political repression, with the Pitești Prison becoming home to an experiment in brainwashing techniques. The earliest traces of human settlements in this area relate to the Paleolithic. Coins minted by the Dacians during the 3rd century BC, copying the design of Thracian tetradrachmon issued by Lysimachus, have been discovered here. A small Roman castrum was built sometime in the 3rd century AD in the vicinity of present-day Pitești (part of a protection system for Roman Dacia and Moesia). During the Age of Migrations, the Pitești area was, according to historian Constantin C. Giurescu, the site of trading between Vlachs and Slavs, which, in his opinion, was the origin of Târgul din Deal ("The Market on the Hill"), a separate locality. The first recorded mention of Pitești itself was on May 20, 1386, when Wallachian Prince Mircea I granted a gristmill in the area to Cozia Monastery. Pitești was subsequently one of the temporary residences of Wallachian Princes.