Several viceroys had scientific, political and economic impact on the Viceroyalty. The conquistadors originally organized it as a captaincy general within the Viceroyalty of Peru. Catherine the Great reorganized Governorate into Riga Viceroyalty. It subsequently became a "cabecera" of the Viceroyalty of New Spain. The modern Peruvian State is the heir of the Viceroyalty of Peru. From 1779 it belonged to the Saratov Viceroyalty. The modern Peru is heir to the Viceroyalty of Peru. Under the Cholas, the city was the headquarters of the northern viceroyalty. Mestizos and other mixed raced combinations were categorized into different castas by viceroyalty administrators. On November 22, 1739 the British captured Portobelo in the Viceroyalty of New Granada. It became the capital and most important city in the Viceroyalty of Peru. The economy of the viceroyalty of Peru largely depended on the export of silver. Irwin relished the pomp of the Viceroyalty. Map of the Tobolsk Viceroyalty, 1792. This territory later became the Viceroyalty of New Spain, present day Mexico.