Within Christianity, the doctrine of the Trinity states that God is a single being that exists, simultaneously and eternally, as a perichoresis of three hypostases (i.e. persons; personae, prosopa): the Father (the Source, the Eternal Majesty); the Son (the eternal Logos ("Word"), manifest in human form as Jesus and thereafter as Christ); and the Holy Spirit (the Paraclete or advocate). Since the 4th Century AD, in both Eastern and Western Christianity, this doctrine has been stated as "One God in Three Persons", all three of whom, as distinct and co-eternal "persons" or "hypostases", share a single divine essence, being, or nature.