Slavery are noted to have existed in the Comoros as long as the history of the islands is documented, and was possibly introduced by the Arab slave trade.
[1] Along with Zanzibar, the Comoros exported slaves to Oman on the Arabian Peninsula.
[2] The Comoros became a middle stop of the slave trade between the Swahili coast of Eastern Africa to French Réunion when slavery was abolished on Réunion and replaced by the engagé-system of indentured labor (1848–1864), when slaves were shipped to the Comoros, and then from the Comoros to Réunion as free indentured workers.
[6] In order to avoid the British Anti Slavery Patrol Fleet on the Indian Ocean, the slave ships from Zanzibar as well as from the Comoros used false papers from French Mayotte in the Comoros to give a false destination for their trip and avoid British confiscation.
[11] An exception was the island of Mayotte, which did become a French colony and slavery was indeed abolished in the 1840s.