A triple deity (sometimes referred to as threefold, tripled, triplicate, tripartite, triune or triadic, or as a trinity) is three deities that are worshipped as one. Such deities are common throughout world mythology; the number three has a long history of mythical associations. Carl Jung considered the arrangement of deities into triplets an archetype in the history of religion.
In classical religious iconography or mythological art, three separate beings may represent either a triad who always appear as a group (Greek Moirai, Charites, Erinyes; Norse Norns; or the Irish Morrígan) or a single deity known from literary sources as having three aspects (Greek Hecate, Roman Diana).
Georges Dumézil's trifunctional hypothesis proposed that ancient Indo-European society conceived itself as structured around three activities: worship, war, and toil. In later times, when slave labor became common, the three functions came to be seen as separate "classes", represented each by its own god. Dumézil understood this mythology as reflecting and validating social structures in its content: such a tripartite class system is found in ancient Indian, Iranian, Greek and Celtic texts. In 1970, Dumézil proposed that some goddesses represented these three qualities as different aspects or epithets and identified examples in his interpretation of various deities including the Iranian An?hit?, the Vedic Sarasvat? and the Roman Juno.
Vesna Petreska posits that myths including trinities of female mythical beings from Central and Eastern European cultures may be evidence for an Indo-European belief in trimutive female "spinners" of destiny. But according to the linguist M. L. West, various female deities and mythological figures in Europe show the influence of pre-Indo-European goddess-worship, and triple female fate divinities, typically "spinners" of destiny, are attested all over Europe and in Bronze Age Anatolia.
Qudshu-Astarte-Anat is a representation of a single goddess who is a combination of three goddesses: Qetesh (Athirat "Asherah"), Astarte, and Anat. It was a common practice for Canaanites and Egyptians to merge different deities through a process of syncretization, thereby, turning them into one single entity. This "Triple Goddess Stone", once owned by Winchester College, shows the goddess Qetesh with the inscription "Qudshu-Astarte-Anat", showing their association as being one goddess, and Qetesh (Qudshu) in place of Athirat.
Religious scholar Saul M. Olyan (author of Asherah and the Cult of Yahweh in Israel), calls the representation on the Qudshu-Astarte-Anat plaque "a triple-fusion hypostasis", and considers Qudshu to be an epithet of Athirat by a process of elimination, for Astarte and Anat appear after Qudshu in the inscription.
The Roman goddess Diana was venerated from the late sixth century BC as diva triformis, "three-form goddess", and early on was conflated with the similarly-depicted Greek goddess Hekate.Andreas Alföldi interpreted a late Republican numismatic image as Diana "conceived as a threefold unity of the divine huntress, the Moon goddess and the goddess of the nether world, Hekate". This coin shows that the triple goddess cult image still stood in the lucus of Nemi in 43 BC. The Lake of Nemi was Triviae lacus for Virgil (Aeneid 7.516), while Horace called Diana montium custos nemoremque virgo ("keeper of the mountains and virgin of Nemi") and diva triformis ("three-form goddess"). In his commentary on Virgil, Maurus Servius Honoratus said that the same goddess was called Luna in heaven, Diana on earth, and Proserpina in hell.
Spells and hymns in Greek magical papyri refer to the goddess (called Hecate, Persephone, and Selene, among other names) as "triple-sounding, triple-headed, triple-voiced..., triple-pointed, triple-faced, triple-necked". In one hymn, for instance, the "Three-faced Selene" is simultaneously identified as the three Charites, the three Moirai, and the three Erinyes; she is further addressed by the titles of several goddesses. Translation editor Hans Dieter Betz notes: "The goddess Hekate, identical with Persephone, Selene, Artemis, and the old Babylonian goddess Ereschigal, is one of the deities most often invoked in the papyri."
E. Cobham Brewer's 1894 Dictionary of Phrase & Fable contained the entry, "Hecate: A triple deity, called Phoebe or the Moon in heaven, Diana on the earth, and Hecate or Proserpine in hell," and noted that "Chinese have the triple goddess Pussa". The Roman poet Ovid, through the character of the Greek woman Medea, refers to Hecate as "the triple Goddess"; the earlier Greek poet Hesiod represents her as a threefold goddess, with a share in earth, sea, and starry heavens. Hecate was depicted variously as a single womanly form; as three women back-to-back; as a three-headed woman, sometimes with the heads of animals; or as three upper bodies of women springing from a single lower body ("we see three heads and shoulders and six hands, but the lower part of her body is single, and closely resembles that of the Ephesian Artemis").
The Olympian demiurgic triad in platonic philosophy, made up of Zeus (considered the Zeus [king of the gods] of the Heavens), Poseidon (Zeus of the seas) and Pluto/Hades (Zeus of the underworld), all considered in the end to be a monad and the same Zeus, and the Titanic demiurgic triad of Helios (sun when in the sky), Apollo (sun seen in our world) and Dionysus (god of mysteries, "sun" of the underworld) (as can be seen on Plato's Phaed on the myth Dionysus and the Titans)
The Matres or Matronae are usually represented as a group of three but sometimes with as many as 27 (3 × 3 × 3) inscriptions. They were associated with motherhood and fertility. Inscriptions to these deities have been found in Gaul, Spain, Italy, the Rhineland and Britain, as their worship was carried by Roman soldiery dating from the mid 1st century to the 3rd century AD.Miranda Green observes that "triplism" reflects a way of "expressing the divine rather than presentation of specific god-types. Triads or triple beings are ubiquitous in the Welsh and Irish mythic imagery" (she gives examples including the Irish battle-furies, Macha, and Brigit). "The religious iconographic repertoire of Gaul and Britain during the Roman period includes a wide range of triple forms: the most common triadic depiction is that of the triple mother goddess" (she lists numerous examples).
In the case of the Irish Brigid it can be ambiguous whether she is a single goddess or three sisters, all named Brigid.The Morrígan also appears sometimes as one being, and at other times as three sisters, as do the three Irish goddesses of sovereignty, Ériu, Fódla and Banba.
In Hinduism, the supreme divinity Para Brahman can take the form of the Trimurti, in which the cosmic functions of creation, preservation, and destruction of the universe are performed by the three deities of Brahma (the creator), Vishnu (the preserver), and Shiva (the destroyer), who are at the same time three forms of the one Para Brahman. The divine being Dattatreya is a representation of all three of these deities incarnated as a single being.
Christians profess "one God in three divine persons" (God the Father, God the Son and God the Holy Ghost). This is not to be understood as a belief in (or worship of) three Gods, nor as a belief that there are three subjectively-perceived "aspects" in one God, both of which the Catholic Church condemns as heresy. The Catholic Church also rejects the notions that God is "composed" of its three persons and that "God" is a genus containing the three persons.
Many Christian saints, especially martyrs, are trios who share a feast day or other remembrance. Whether they are subject to actual veneration and prayed to for supernatural aid, or simply honored, varies by Christian denomination.
Peter H. Goodrich interprets the literary figure of Morgan le Fay as a manifestation of a British triple goddess in the medieval romance Sir Gawain and the Green Knight. A modern idea of a triple goddess is central to the new religious movement of Wicca.
Hecate will never join in that offence:
Unjust is the request you make, and I
In kindness your petition shall deny;
Yet she that grants not what you do implore,
Shall yet essay to give her Jason more;
Find means t' encrease the stock of Aeson's years,
Without retrenchment of your life's arrears;
Provided that the triple Goddess join
A strong confed'rate in my bold design.