Giordano Bruno (January 1548 – 17 February 1600) was an Italian friar of the Dominican Order. He was also a philosopher and mathematician. He is best known for believing in the infinity of the universe. His cosmological theories went beyond the Copernican model.
Bruno thought the Sun was just one of an infinite number of independently moving heavenly bodies. He is the first man to have thought the stars we see at night are identical in nature to the Sun. For publishing beliefs contrary to Roman Catholic dogma about transubstantiation, trinity and other matters, he was burnt at the stake as a heretic by the Inquisition of the Roman Catholic Church.
Bruno also wrote extensive works on the art of memory, a loosely organized group of mnemonic techniques and principles.