Dispatches of January 23, 1768, exchanged between King Carlos and the viceroy, set the wheels in motion to extend Spain's control up the Pacific Coast and establish colonies and missions at San Diego Bay and Monterey Bay, which had been discovered and described in reports by earlier explorers Juan Cabrillo and Sebastián Vizcaíno. Vizcaíno had mapped the California coastline as far north as Monterey in 1602, but no significant Spanish settlement or even trading station had followed because those earlier explorations had failed to find a good harbor that the Spanish could have used for their long-standing Pacific maritime trade between Asia and Mexico: the Monterey Bay, sighted by both Cabrillo and Vizcaíno, was exposed to rough currents and winds. In May 1768, the Spanish Visitor General, José de Gálvez, began to organize an expedition, by sea and by land. Portolá was created "Governor of the Californias" and given overall command. Junípero Serra, leader of the expedition's Franciscan missionaries, took command of spiritual matters. Sea and land detachments were to meet at San Diego Bay.