Servetus was a Spaniard who boldly criticised Christian dogma. In
particular, he rejected the doctrine of the Trinity. In July 1530 he
disputed with Johannes Oecolampadius in Basel and was eventually expelled.
He went to Strasbourg where he published a pamphlet against the Trinity.
Bucer publicly refuted it and asked Servetus to leave. After returning to
Basel, Servetus published Dialogorum de Trinitate libri duo (Two Books of
Dialogues on the Trinity) which caused a sensation among Reformers and
Catholics alike. The Inquisition in Spain ordered his arrest.
Calvin and Servetus were first brought into contact in 1546 through a
common acquaintance, Jean Frellon of Lyon. They exchanged letters debating
doctrine until Calvin lost patience and refused to respond; by this time
Servetus had written around thirty letters to Calvin. Calvin was
particularly outraged when Servetus sent him a copy of the Institutes of
the Christian Religion heavily annotated with arguments pointing to errors
in the book. When Servetus mentioned that he would come to Geneva if Calvin
agreed, Calvin wrote a letter to Farel on 13 February 1547 noting that if
Servetus were to come, he would not assure him safe conduct: "for if he
came, as far as my authority goes, I would not let him leave alive."

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