In 1553, the execution of theologian Michael Servetus by Calvinists in Geneva marked a significant event in the history of religious tolerance and heresy. Servetus was burned at the stake for his anti-Trinitarian beliefs, highlighting the tensions between emerging Protestant movements and traditional doctrines. This event underscored the dangers faced by dissenters during the Reformation and sparked ongoing debates about freedom of conscience and religious authority.

The execution of Michael Servetus by Calvinists in 1553 sparked debates on tolerance, influencing Unitarian and Enlightenment poetry. Poets like John Milton and William Blake addressed themes of freedom of belief and individual conscience in their writings, contributing to the discourse on religious liberty.