Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Slavery in medieval Europe:

This text has been unreferenced on Wikipedia for a very long time. If you can't find a source, be bold and remove it!

"

Demand from the Islamic world, which arose in the seventh century, dominated the slave trade in Europe during the medieval period (500–1500).[1][2][3] For most of that time, the sale of Christian slaves to non-Christians was banned.[citation needed] In the pactum Lotharii of 840 between Venice and the Carolingian Empire, Venice promised not to buy Christian slaves in the Empire, and not to sell Christian slaves to Muslims.[1][4][5] The Church prohibited the export of Christian slaves to non-Christian lands, for example in the Council of Koblenz in 922, the Council of London in 1102, and the Council of Armagh in 1171.[6]