Michael Servetus was a 16th-century Spanish theologian, physician, and humanist known for his controversial ideas and contributions to both medicine and religious thought. Born in 1511 in Villanueva de Sigena, he became recognized for his outspoken criticism of traditional Christian doctrines, especially the doctrine of the Trinity, which led to his persecution by both Catholic and Protestant authorities. Servetus authored several significant works, including "De Trinitatis Erroribus," where he rejected the orthodox understanding of the Trinity, challenging established church teachings. His work and beliefs brought him into conflict with religious leaders, ultimately resulting in his arrest and trial. His ideas played a role in theological debates of the Reformation era, and he was considered a heretic by many at the time. In addition to his theological pursuits, Servetus was a pioneering physician who made advances in pulmonary science and the understanding of the circulatory system. His innovative medical work was ahead of his time, and he also contributed to the study of pharmacology. Despite his death in 1553, his ideas influenced both religious thought and science, and he is remembered as a complex figure who challenged conventions and sought truth in multiple fields. Michael Servetus was a 16th-century Spanish theologian, physician, and humanist known for his controversial ideas and contributions to both medicine and religious thought. Born in 1511 in Villanueva de Sigena, he became recognized for his outspoken criticism of traditional Christian doctrines, especially the doctrine of the Trinity, which led to his persecution by both Catholic and Protestant authorities. Servetus authored several significant works, including "De Trinitatis Erroribus," where he rejected the orthodox understanding of the Trinity, challenging established church teachings. His work and beliefs brought him into conflict with religious leaders, ultimately resulting in his arrest and trial. His ideas played a role in theological debates of the Reformation era, and he was considered a heretic by many at the time. In addition to his theological pursuits, Servetus was a pioneering physician who made advances in pulmonary science and the understanding of the circulatory system. His innovative medical work was ahead of his time, and he also contributed to the study of pharmacology. Despite his death in 1553, his ideas influenced both religious thought and science, and he is remembered as a complex figure who challenged conventions and sought truth in multiple fields.