who came up with the doctrine of the trinity
Trinity Tertullian, a Latin theologian who wrote in the early 3rd century, is credited as being the first to use the Latin words "Trinity",[32] "person" and "substance"[33] to explain that the Father, Son, and Holy Spirit are "tres personae, una substantia".[34] While "personae" is often translated as "persons," the Latin word personae is better understood as referring to roles as opposed to individual centers of consciousness.