Servetus was a unique and central figure in European history. When he was burned alive in Geneva on October 27, 1553, all unbound copies of his major work went up in smoke with him. Today, only three surviving copies of the original publication are known. Except for a fragment of a few pages concerning the famous discovery of the pulmonary circulation, the book was never translated into English. The present edition is the first translation into English and includes the first part of the original text."