Matthijs Hendrikszoon Quast (died 6 October 1641), anglicized as Matthys and Matthew Quast, was a Dutch merchant and explorer in the service of the Dutch East India Company (VOC). Quast made several voyages on the VOC's behalf to Tokugawa Japan, the Qing Empire (China), and Ayutthaya Kingdom ("Siam") but is primarily remembered for his failed 1639 expedition in search of the phantom islands of Rica de Oro and Rica de Plata previously reported by Spanish mariners. He is sometimes credited with the first recorded discovery of the Bonin Islands during the voyage, although the VOC did nothing with the information and they remained unimportant and sparsely settled until the 19th century. 1639 Expedition Claims that southern or eastern seas held islands rich with gold and silver are at least as old as the ancient Greeks, who called them Chryse and Argyre. Spanish mariners had placed their and ("Island Rich with Gold" and "with Silver") at various locations around the North Pacific for decades. Quast's expedition was occasioned by a 7 December 1635 report from Willem Verstegen, a VOC trader at Dejima off Nagasaki, that seemed to verify the Spanish claims, placing Kinshima "Island of Gold") and Ginshima "Island of Silver") somewhere vaguely east of Honshu. (For his part, Verstegen specifically located the islands to be discovered at 37° 30′ N. somewhere within 400 mijls of the Japanese coast.) The VOC officials at the eastern headquarters of Batavia on Java in the Dutch East Indies (now Jakarta, Indonesia) were unimpressed and uninterested but were eventually overruled by the heeren back in the Netherlands, who ordered them to investigate. Quast was instructed to go to the area matching the Spanish and Japanese accounts by way of the Philippines and then to continue northwest from there to explore Korea and the possibilities for a Northeast Passage around Mongolia, Manchuria, and Siberia ("Tartary"). The VOC reserving its good ships for trading voyages with certain profit upon completion, the expedition was given the two small and run-down ships (Dutch for "Angel") and or ("Urban Canal"). Quast and his commander Lucas Albertsen used the Engel as the flagship while his lieutenant Abel Tasmannow famous for his later voyages to Australiacaptained the Gracht. The expedition left Batavia on 2 June 1639. It passed Luzon into the open water of the Pacific on 10 July. Eager to find the two islands, Quast raised the bonus for the first