San Miguel de Tucumán (usually called simply Tucumán) is the capital of the Tucumán Province, located in northern Argentina at 1,311 kilometres (815 mi) from Buenos Aires. The fifth-largest city of Argentina after Buenos Aires, Córdoba, Rosario and Mendoza, it is the most important city of Northern Argentina. The Spanish Conquistador Diego de Villarroel (es) founded the city in 1565 in the course of an expedition from present-day Peru.