Gulliver's Travels is a prose satire by Irish writer and clergyman Jonathan Swift, that is both a satire on human nature and the "travellers' tales" literary subgenre. It is Swift's best known full-length work, and a classic of English literature. He himself claimed that he wrote Gulliver's Travels "to vex the world rather than divert it." Gulliver's Travels is an adventure story involving several voyages of Lemuel Gulliver, a ship's surgeon, who, because of a series of mishaps en route to recognized ports, ends up, instead, on several unknown islands living with people and animals of unusual sizes, behaviors, and philosophies, but who, after each adventure, is somehow able to return to his home in England where he recovers from these unusual experiences and then sets out again on a new voyage. The book became popular as soon as it was published. John Gay wrote in a 1726 letter to Swift that "It is universally read, from the cabinet council to the nursery." It was once compared in terms of book sales with Love in Excess.