 Charles V borrowed money from German and Italian bankers and, in order to repay such loans, he relied on the proto-capitalist economy of the Low Countries and on the flows of precious metals from South America to Spain, which were the chief source of his wealth but also the cause of widespread inflation.He ratified the Spanish conquest of the Aztec and Inca empires by the Spanish "Conquistadores" Hernán Cortés and Francisco Pizarro, as well as the establishment of Klein-Venedig by the German Welser family in search of the legendary El Dorado.In order to consolidate power in his early reign, Charles suppressed two Spanish insurrections (Comuneros' Revolt and Brotherhoods' Revolt) and two German rebellions (Knights' Revolt and Great Peasants' Revolt).