Interesting,

So you are unaware of any of the various Inquisitions targeting Alchemist, Astrologers, Numerologists, and the like and that a knowledge of mathematics by a lay person or churchman of a different order made one a suspect of The Black Friars? Why, a Mathematician was synonymous with the practice of these foul arts and who you would go to in order to acquire knowledge of them.

And their practice was wide spread. Many people, including the powerful went to great lengths to conceal their birth information.