San Marino is a landlocked republic in central Italy, located on the north-east side of the Apennine Mountains near Rimini. The sovereign enclave claims to be the oldest and longest surviving constitutional republic, founded in AD 301 by stonecutter Marinus of Arba. San Marino resisted Papal claims and those of neighbouring kingdoms throughout its history, and declined unification with Italy in the 19th century. The nation remained neutral through both World Wars, and has prospered post-war with a stable economy and a high Gross Domestic Product per capita. The capital and largest city is the City of San Marino, known unofficially as Città. Estimated population of San Marino in 2012 was 32,576.