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- William Mahone
- James Madison
- Yaqub al-Mansur
- Menkauhor Kaiu (Egyptian Pharaoh)
- Menkaura (Egyptian Pharaoh)
- Merneith (Egyptian Pharaoh)
- James Monroe
- Montezuma, Aztec Emperor
- Muhammad
- Moses
Read more about this topic: List Of Slave Owners
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Read more about this topic: List Of Slave Owners