>> I looked it up on the net and found estimates ranging from 10,000 to 100,000. <<
Really? Gee, because that’s funny: the very first primary source *I* could find said 762. And that was from a 16th-century, Protestant polemic: the Martyrology of the Huguenots.
The later and later you go from the original date, the higher and higher the estimates go.
I did go to Wikipedia, admittedly