The South American Republics, page 22 - "[...] it was not until 1573 that the Spaniards from Asuncion succeeded in founding a city south of the confluence of the Paraná and Paraguay. Santa Fé was the first Spanish settlement on the Plate in territory now a part of the Argentine Republic. [...] The man who led the creoles to the pampa was Juan de Garay, a Basque, who had been one of the soldiers in the army that conquered Peru."
