Raleigh or Ra·legh (rô'lē, rä'-) English courtier, navigator, colonizer, and writer. A favorite of Elizabeth I, he campaigned in Ireland and Cádiz, explored Guiana, colonized Virginia, and introduced tobacco and the potato to Europe. Convicted of treason by James I, he was released for another expedition to Guiana and executed after its failure. His literary works include poetry, memoirs, and a world history.