Zanj rebellion
Zanj rebellion, (AD 869–883), a black-slave revolt against the ʿAbbāsid caliphal empire. A number of Basran landowners had brought several thousand East African blacks (Zanj) into southern Iraq to drain the salt marshes east of Basra. The landowners subjected the Zanj, who generally spoke no Arabic, to heavy slave labour and provided them with only minimal subsistence.
https://www.britannica.com/event/Zanj-rebellion
Zanj rebellion, (AD 869–883), a black-slave revolt against the ʿAbbāsid caliphal empire. A number of Basran landowners had brought several thousand East African blacks (Zanj) into southern Iraq to drain the salt marshes east of Basra. The landowners subjected the Zanj, who generally spoke no Arabic, to heavy slave labour and provided them with only minimal subsistence.
https://www.britannica.com/event/Zanj-rebellion
teachings of the Bible are so muddled and self-contradictory that it was possible for Christians to happily burn heretics alive for five long centuries. It was even possible for the most venerated patriarchs of the Church, like St. Augustine and St. Thomas Aquinas, to conclude that heretics should be tortured (Augustine) or killed outright (Aquinas). Martin Luther and John Calvin advocated the wholesale murder of heretics, apostates, Jews, and witches. - Sam Harris, "Letter To A Christian Nation"