Las Piedras was founded in 1744 under the name "San Isidro".
On May 18, 1811 the Uruguayan independence leader don Jos� Gervasio Artigas led patriot forces to victory against Spain at the Battle of Las Piedras. While not the definitive event in the country's independence process, it marked a significant step towards the eventual establishment of an independent Uruguay.
It had acquired the status of "Pueblo" (village) before the Independence of Uruguay. Its status was elevated to "Ciudad" (city) on 15 May 1925 by the Act of Ley N� 7.837
