Christian doctrine that God exists in three persons
The Trinity (Latin: Trinitas, lit. 'triad', from trinus 'threefold') is the Christian doctrine concerning the nature of God, which defines one God existing in three, coeternal, consubstantial divine persons: God the Father, God the Son (Jesus Christ) and God the Holy Spirit, three distinct persons (hypostases) sharing one essence/substance/nature (homoousion). As the Fourth Lateran Council declared, it is the Father who begets, the Son who is begotten, and the Holy Spirit who proceeds. In this context, one essence/nature defines what God is, while the three persons define who God is.
https://en.wikipedia.org/wiki/Trinity
The Trinity (Latin: Trinitas, lit. 'triad', from trinus 'threefold') is the Christian doctrine concerning the nature of God, which defines one God existing in three, coeternal, consubstantial divine persons: God the Father, God the Son (Jesus Christ) and God the Holy Spirit, three distinct persons (hypostases) sharing one essence/substance/nature (homoousion). As the Fourth Lateran Council declared, it is the Father who begets, the Son who is begotten, and the Holy Spirit who proceeds. In this context, one essence/nature defines what God is, while the three persons define who God is.
