Setebos is the outermost moon but one of Uranus. Setebos was discovered on 18 July 1999, together with Stephano and Prospero, by Brett Gladman, Matthew Holman, and J. J. Kavelaars using the Canada-France-Hawaii Telescope. It is named after the god worshipped by Caliban and Sycorax in Shakespeare's play The Tempest and is also known as Uranus XIX. Setebos is a small, irregular moon with a highly inclined, retrograde orbit.