John Cabot's initial failure in 1497 to find a Northwest Passage across the Atlantic led the British to seek an alternative route to the east. Interest re-kindled in 1564 after Jacques Cartier's discovery of the mouth of the Saint Lawrence River. Martin Frobisher had formed a resolution to undertake the challenge of forging a trade route from England westward to India. From 1576 to 1578, he took three trips to what is now the Canadian Arctic in order to find the passage. Frobisher Bay is named after him. In July 1583, Sir Humphrey Gilbert, who had written a treatise on the discovery of the passage and was a backer of Frobisher's, claimed the territory of Newfoundland for the English crown. In 1585, under the employ of Elizabeth I, the English explorer John Davis entered Cumberland Sound, Baffin Island. Davis rounded Greenland before dividing his four ships into separate expeditions to search for a passage westward. Though he was unable to pass through the icy Arctic waters, he reported to his sponsors that the passage they sought is "a matter nothing doubtfull ," and secured support for two additional expeditions, reaching as far as Hudson Bay. Though England's efforts were interrupted in 1587 because of the Anglo-Spanish War, Davis's favorable reports on the region and its people would inspire explorers in the coming century. In 1609, while in the service of the Dutch East India Company, the English explorer Henry Hudson sailed up what is now called the Hudson River in search of the Passage; he reached present-day Albany, New York, before giving up. He later explored further north into the Arctic and Hudson Bay for the Passage. The Northeast Passage is a broad term for any route lying above the Eurasian continent and stretching between the waters north of the Norwegian Sea to the Bering Strait. The "Northern Sea Route" is defined as a specific portion of such routes. The "Northern Sea Route" (capitalized) as currently officially defined by Russian Federation law includes shipping lanes falling within Russia's EEZ and extending from the Kara Sea to the Bering Strait along the Russian northern coast. The idea to explore this region was initially economic, and was first put forward by Russian diplomat Dmitry Gerasimov in 1525. The entire route lies in Arctic waters and parts are only totally free of ice for about two months per year, making it a very perilous journey. In the mid-16th century, John Cabot's son Sebastian helped organize just such an expedition, led by Sir Hugh Willoughby and Richard Chancellor.