 Pierre Caroli, a Protestant minister in Lausanne accused Calvin as well as Viret and Farel of Arianism in 1536.Calvin defended his beliefs on the Trinity in "Confessio de Trinitate propter calumnias P. Caroli".In 1551 Jérôme-Hermès Bolsec, a physician in Geneva, attacked Calvin's doctrine of predestination and accused him of making God the author of sin.