Giordano Bruno

regarding the WaPo's review Ingrid Rowland's Giordano Bruno: Philospher / Heretic, a bit more background from the 1908 Catholic Encyclopedia:

Bruno was not condemned for his defence of the Copernican system of astronomy, nor for his doctrine of the plurality of inhabited worlds, but for his theological errors, among which were the following: that Christ was not God but merely an unusually skillful magician, that the Holy Ghost is the soul of the world, that the Devil will be saved, etc.

also note that he was excommunicated by the Calvinists and Lutherans.