A slave rebellion is an armed uprising by slaves. Slave rebellions have occurred in nearly all societies that practice, or have practiced in the past, slavery, and are amongst the most feared events for slaveholders.
The most successful slave rebellion in history was the 18th-century Haitian Revolution, led by Toussaint Louverture and later Jean-Jacques Dessalines who won the war against their French colonial rulers, which founded the country formally known as Saint Domingue. Other famous historic slave rebellions have been led by the Roman slave Spartacus (c. 73-71 BC), as well as the thrall (Scandinavian slave) Tunni, who rebelled against the Swedish monarch Ongentheow, a rebellion that needed Danish assistance to be quelled. In the ninth century, the poet-prophet Ali bin Muhammad led imported East African slaves in Iraq during the Zanj Rebellion against the Abbasid Caliphate; Nanny of the Maroons was an 18th-century leader who rebelled against the British in Jamaica; and the Quilombo dos Palmares of Brazil flourished under Ganazumba (Ganga Zumba). The 1811 German Coast Uprising in the Territory of New Orleans was the largest rebellion in the continental United States; Denmark Vesey rebelled in South Carolina, and Madison Washington during the Creole case in the 19th century United States.
Ancient Sparta had a special type of serf called helots who were often treated harshly, leading them to rebel. According to Herodotus (IX, 28–29), helots were seven times as numerous as Spartans. Every autumn, according to Plutarch (Life of Lycurgus, 28, 3–7), the Spartan ephors would pro forma declare war on the helot population so that any Spartan citizen could kill a helot without fear of blood or guilt in order to keep them in line (crypteia).