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@ Aciram: The source cited for this claim is "Korpela, J. (2018). Slaves from the North: Finns and Karelians in the East European Slave Trade, 900–1600. Nederländerna: Brill. 242" There is one paragraph about religiously-motivated slavery:

Traditional targets of slave hunting were members of enemy tribes or populations who have represented different religions. Animists and traditional cults did not have moral problems with slavery. At first, nor did Christians, because the Bible has nothing against slaves, but the problem was created in the High Middle Ages, when scholars denied that Christians could be slaves. Heretic Christians were still seen as suitable, however. Similarly, Muslins did not accept the enslavement of other Muslims, except their own 'heretics: Shi'ites could enslave Sunnis and vice versa.

I don't see anything there that supports the claim that Catholics considered it acceptable to enslave Orthodox Christians or vice versa. I haven't looked through the whole book, perhaps it's stated elsewhere? Could you give a quote or page number? There's a preview on Google Books or if you send me an email I can give you the full text as a PDF. –  Joe ( talk) 07:38, 7 July 2024 (UTC) reply

Hm, it must have been somewhere else in the book, and so it became part of a summary... It is a fact that many Orthodox Christian Russian and Ukrainians were enslaved and trafficked by the Genoese to Western Europe from Kaffa, but perhaps it was not a part of that religious context, strange. It's alright if you remove that part for now, and I can look through it when I have the time (I don't for now). Thank you for showing me.-- Aciram ( talk) 11:55, 7 July 2024 (UTC) reply