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- Baibars, a Kipchack Turk who became a Mamluk Sultan of Egypt and Syria.
- Sarah Basset (d.1730), American slave.
- Balthild, a 7th century Anglo-Saxon woman of elite birth, was sold into slavery on the Continent as a young girl and served in the household of Erchinoald, mayor of the palace of Neustria. Later she married King Clovis II. As a Queen - after her husband's death holding power as regent for her son Clotaire - she abolished the practice of trading Christian slaves and sought the freedom of children sold into slavery. Forced into a convent when her son came of age, Balthild was canonised by Pope Nicholas I about 200 years after her death.
- Batteas, a black slave sold by the Choctaw chief Francimastabe to Benjamin James, was later stolen by Robert Welsh.
- Benedict the Moor (1526 – April 4, 1589), slave and Italian saint.
- Bilal ibn Ribah, 6th century, was freed. He converted to Islam and was Muhammad's muezzin.
- Billy, a seven-year-old black boy captured by Creek raiders in 1788; he passed through several hands before being sold at auction in Havana.
- Henry Bibb, 1815–1854) was an American author and abolitionist who was born a slave. After escaping from slavery to Canada, he founded an abolitionist newspaper, The Voice of the Fugitive. He returned to the US and lectured against slavery.
- Blaesus and Blaesia, whose late Republican Rome tomb inscription name them as the freedman of Caius, and the freedwoman of Aulus.
- Blandina, a slave and martyr.
- Boga, a slave in Anglo-Saxon England, and all his family, were freed by his mistress Æthelgifu's will.
- Booker T. Washington (1856–1915), born into slavery, became an American educator, author and leader of the African-American community after the Civil War.
- Brigitta Scherzenfeldt (1698–1733), Swedish memoirist and weaving teacher, was captured during the Great Northern War and lived as a slave in the kingdom of the Kalmyk in Central Asia.
Read more about this topic: List Of Slaves