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A while back I was perusing some of the older threads about the Khazars and one person made an off-hand comment that there may have been attempts to convert the Bulgarian Empire to Judaism around that time.
Recently I had a quick Google and found a couple of articles (here and here) that briefly mention that there may have been attempts to convert the Bulgars to Judaism during the reign of Boris I but ultimately Christianity won out.
I was wondering if anyone had anymore information about such attempts and what the effects of their success would be?