Giordano Bruno was an itinerant Italian friar who was burned at the stake in 1600 for heresies, that included his rejection of the Ptolemaic cosmology. Like Galileo, who met a similar fate for similar reasons later in the century, Bruno has been accorded martyrdom to the cause of scientific truth and regarded as a visionary whose ideas were out of joint with the superstitions of his time. In fact, as editors Edward Gosselin and Lawrence Lerner point out, Bruno was far more complex, and his thought far more intricate, than simple stereotype would suggest.

Possibly mad, certainly...