Trinity

The Trinity can be considered a fundamental doctrine in Christianity, by which God is considered as existing in three persons. While the doctrine is not explicitly taught in the New Testament, early Christian communities testified to a perception that Jesus was God in the flesh; the idea of the Trinity has been inferred from the Gospel of St. John. The developed doctrine of the Trinity describes that God exists in ultimately three forms: God the Father, God the Son, and God the Holy Spirit.

Information obtained from: http://www.holytrinitydc.org/, http://en.wikipedia.org/wiki/Trinity