"Udo of Aachen" was the first fictional monk to find the "Mandelbrot" set:
https://users.math.yale.edu/public_html/People/frame/Fractal...
https://users.math.yale.edu/public_html/People/frame/Fractal...
https://en.wikipedia.org/wiki/Udo_of_Aachen
(I originally missed the "Fictional" part of the original comment. Time to try to wake up more)