An ESNE was an ancient slave in the Middle Ages who was owned by a feudal lord and worked as a servant. A HELOT was an ancient slave in Sparta who was owned by the state and worked the land. Amistad was a slave ship that was involved in a famous court case in 1839, when the slaves aboard revolted and were eventually freed. Dred Scott was a slave in the United States who sued for his freedom in 1857, but the Supreme Court ruled against him. A SERF was an ancient slave in Europe who was owned by a feudal lord and worked the land. Nat Turner was a slave in the United States who led a slave revolt in 1831. AIDA was an opera by Giuseppe Verdi about an Ethiopian slave who falls in love with an Egyptian soldier.