Öz
The Trinity (taslīs in Arabic), which constitutes the most fundamental dogma of Christianity, expresses a triune conception of God represented as Father, Son, and Holy Spirit. In its current form, the Trinity has been made the official belief basis of Christianity following the decisions taken in the councils, which occupy a significant place in the history of Christianity. In the most general terms, Trinity is the belief that each of these three entities, Father, Son, and Holy Spirit, is God and that there is no superiority or difference between them in divinity. Acceptance of the Trinity is necessary for becoming a Christian. Nevertheless, it is well-known that in the history of Christianity, some individuals and groups rejected the Trinity despite identifying themselves as ‘‘Christians’’. The most notable of these names is Michael Servetus. He is also considered the founder of the movement known today as Unitarianism. Servetus wrote some books in which he seriously criticized the Holy Trinity. According to Servetus, the Trinity is not mentioned in the Holy Bible, and this dogma has no place in the essence of Christianity. The Trinity is a construct fashioned by Greek philosophy and falsifies Christianity. These objections, which made an overwhelming impression in his time, greatly angered the Protestant and Catholic theologians. Servetus was burned to death in Geneva in 1553 due to Catholic and Protestant collaboration. This study examines the religious thought of Michael Servetus, particularly his interpretation of the Trinity, and analyzes his challenges to the traditional understanding of the Trinity.