 The opposition realised that they could curb Calvin's authority, but they did not have enough power to banish him.The turning point in Calvin's fortunes occurred when Michael Servetus, a brilliant Spanish scientist, discoverer of Pulmonary circulation and polymath and a fugitive from ecclesiastical authorities, appeared in Geneva on 13 August 1553.Servetus was a fugitive on the run after he published "The Restoration of Christianity (1553)," Calvin scholar Bruce Gordon commented "Among its offenses were a denial of original sin and a bizarre and hardly comprehensible view of the Trinity."