San Miguel de Tucumán (usually referred to as simply Tucumán) is the capital of the Tucumán Province, located in northern Argentina at 1,311 kilometres (815 mi) from Buenos Aires. It is the fifth biggest city of Argentina after Buenos Aires, Córdoba, Rosario and Mendoza, and it is also the most important city of Northern Argentina. It was founded in 1565 by Spanish Conquistador Diego de Villarroel during an expedition from Peru, and was moved to its present site in 1685.