 By 1547, opposition to Calvin and other French refugee ministers had grown to constitute the majority of the syndics, the civil magistrates of Geneva. On 27 June an unsigned threatening letter in Genevan dialect was found at the pulpit of St. Pierre Cathedral where Calvin preached. Suspecting a plot against both the church and the state, the council appointed a commission to investigate. Jacques Gruet, a Genevan member of Favre's group, was arrested and incriminating evidence was found when his house was searched. Under torture, he confessed to several crimes including writing the letter left in the pulpit which threatened the church leaders. A civil court condemned Gruet to death and he was beheaded on 26 July. Calvin was not opposed to the civil court's decision.
