A Spanish Bishop, Tomas de Berlanga, who called them Las Islas Encantadas - the enchanted isles, discovered the islands in 1535. He named them after seeing the shells of the tortoises on one of the islands, which reminded him of a horse’s saddle or “Galapago” in old Spanish. Many pirates and buccaneers frequented the islands, including the Englishmen William Dampier, Ambrose Cowley and Woodes Rogers, who drew the first maps and named many of the islands after contemporary kings, heroes and noblemen of England. In spite of the nomenclature however, the English crown never laid serious claim to possession of the Galapagos, and in 1832 Ecuador officially annexed the islands, naming them the Archipelago de Colon, after Christopher Columbus. Their chief fame, however, comes from the interest shown in them by the young Charles Darwin, who spent a mere five weeks there during his voyage on the Beagle, in 1835. During this brief period he gathered the information, which provided the basis for the then revolutionary theories of his Origin of Species. The Galapagos are nowadays one of the world's most celebrated tourist destinations, combining unique zoological interest with great natural beauty. The National Park Authority manages the number of people who visit the islands each year by strict control of the number of boats operating in the islands. The wildlife is protected by the rigorous rules enforced by the Naturalist guides.