Bruno was a mathematician, philosopher, astronomer, occultist, and according to the Catholic church of 16th-century Italy, a heretic. He met a bad end because of his views, but he started out as a friar.

Research: 

• Aquilecchia, Giovanni. "Giordano Bruno". Encyclopedia Britannica, 13 Feb. 2022, https://www.britannica.com/biography/Giordano-Bruno
• “Giordano Bruno.” Stanford Encyclopedia of Philosophy. May 30, 2018. https://plato.stanford.edu/entries/bruno/
• Martinez, Alberto A. “Burned Alive: Bruno, Galileo and the Inquisition.” Reaktion Books. 2018.
• Rosenthal, Erwin I.J.. "Averroës". Encyclopedia Britannica, 1 Jan. 2022, https://www.britannica.com/biography/Averroes
• Alberto A. Martinez Giordano Bruno and the heresy of many worlds, Annals of Science. 73:4, 345-374. 2016. 10.1080/00033790.2016.1193627
• Rowland, Ingrid D. “Giordano Bruno Philosopher, Heretic.” Farrar, Straus & Giroux. 2008.