Trinitarianism in the Church Fathers

Debate exists as to whether the earliest Church Fathers in Christian history believed in the doctrine of the Trinity – the Christian doctrine that God the Father, the Son (Jesus Christ) and the Holy Spirit are three distinct persons sharing one homoousion (essence). Some of the evidence used to support an early belief in the Trinity consists of triadic statements (referring to the Father, Son and Holy Spirit) from the New Testament and from the writings of the Church Fathers.

Source: Wikipedia — Trinitarianism in the Church Fathers (CC BY-SA 4.0)