Tertullian

Tertullian was an early Christian writer and theologian from Carthage, who lived around 155 to 240 AD. He is known for being one of the first to use the term "Trinity" to describe the Christian understanding of God as three persons in one essence: the Father, the Son, and the Holy Spirit. Tertullian's writings defended Christianity against pagan criticisms and heresies, emphasizing the importance of faith and the role of reason. His influence shaped early Christian theology and the development of Western thought, making him a significant figure in the history of Christianity.