Christianismi Restitutio (The Restoration of Christianity) was a book published anonymously in a clandestine workshop in 1553 by Michael Servetus, after it had been rejected by a publisher in Basel.[1] It rejected the Christian doctrine of the Trinity and the concept of predestination, which had both been considered fundamental since the time of St. Augustine and emphasized by John Calvin in his magnum opus, Institutio Christianae Religionis. Servetus argued that God condemns no one who does not condemn himself through thought, word or deed. It also contained, incidentally and by way of illustration, groundbreaking views on pulmonary circulation, a discovery Servetus made independent of the Arab Muslim physician Ibn Al Nafis, and one which challenged the incorrect teachings of Galen.[2]