The Morrígan in the context of "Triple deity"

The Tuatha Dé Danann (Irish: [ˈt̪ˠuə(hə) dʲeː ˈd̪ˠan̪ˠən̪ˠ], usually translated "folk of the goddess Danu"), also known by the earlier name Tuath Dé ("tribe of the gods" or "divine tribe"), are a supernatural race in Irish mythology. Many of them are thought to represent deities of pre-Christian Gaelic Ireland.

The Tuath Dé Danann are often depicted as kings, queens, druids, bards, warriors, heroes, healers and craftsmen who have supernatural powers. They dwell in the Otherworld but interact with humans and the human world. They are associated with the sídhe: prominent ancient burial mounds such as Brú na Bóinne, which are entrances to Otherworld realms. Their traditional rivals are the Fomorians (Fomoire), who might represent the destructive powers of nature, and whom the Tuatha Dé Danann defeat in the Battle of Mag Tuired. Prominent members include the Dagda ("the great god"); The Morrígan ("the great queen" or "phantom queen"); Lugh; Nuada; Aengus; Brigid; Manannán; Dian Cecht the healer; and Goibniu the smith, one of the Trí Dé Dána ("three gods of craft"). Several of the Tuath Dé are cognate with ancient Celtic deities: Lugh with Lugus, Brigit with Brigantia, Nuada with Nodons, Ogma with Ogmios, and Goibniu with Gobannus.

The Dagda (Old Irish: In Dagda [ˈd̪aɣða], Irish: An Daghdha) is considered the great god of Irish mythology. He is the chief god of the Tuatha Dé Danann, with the Dagda portrayed as a father-figure, king, and druid. He is associated with fertility, agriculture, masculinity and strength, as well as magic, druidry and wisdom. He can control life and death (cf. his staff), the weather and crops, as well as time and the seasons.

He is often described as a large bearded man or giant wearing a hooded cloak. He owns a magic staff (lorc) of dual nature: it kills with one end and brings to life with the other. He also owns a cauldron (the coire ansic) which never runs empty, and a magic harp (Uaithne, though this may be the name of the harper), which will not play unless called by its two bynames, and the harp can fly itself to the Dagda when thus beckoned. He is said to dwell in Brú na Bóinne (Newgrange). Other places associated with or named after him include Uisneach, Grianan of Aileach, Lough Neagh and Knock Iveagh. The Dagda is said to be the husband of the Morrígan and lover of Boann. His children include Aengus, Brigit, Bodb Derg, Cermait, Aed, and Midir.

Macha (Irish pronunciation: [ˈmˠaxə]) was a sovereignty goddess of ancient Ireland associated with the province of Ulster, particularly the sites of Navan Fort (Eamhain Mhacha) and Armagh (Ard Mhacha), which are named after her. Several figures called Macha appear in Irish mythology and folklore, all believed to derive from the same goddess. She is said to be one of three sisters known as 'the three Morrígna'. Like other sovereignty goddesses, Macha is associated with the land, fertility, kingship, war and horses.

Proinsias Mac Cana discusses three Machas: Macha, wife of Nemed; Queen Macha, wife of Cimbáeth; and Macha, wife of Crunnchu, who caused the debility of the Ulstermen. Gregory Toner discusses four, with the addition of Macha as one of the three Morrigans.

A triple deity is a deity with three apparent forms that function as a singular whole. Such deities may sometimes be referred to as threefold, tripled, triplicate, tripartite, triune, triadic, or as a trinity. The number three has a long history of mythical associations and triple deities are common throughout world mythology. Carl Jung considered the arrangement of deities into triplets an archetype in the history of religion.

In classical religious traditions, three separate beings may represent either a triad who typically appear as a group (the Greek Moirai, the Roman Parcae, the Norse Norns, the Baltic Dēkla, Kārta and Laima, or the Irish Badb, Macha and Morrígan), or a single deity notable for having three aspects (Greek Hecate and Hellenistic Hermes Trismegistus). Trinitarian Christianity instead recognizes three "divine persons" in God the Father, the Son, and the Holy Spirit, which are usually distinguished from the idea of independent gods or aspects.

A hag is a wizened old woman, or a kind of fairy, witch, or goddess having the appearance of such a woman, often found in folklore and children's tales such as "Hansel and Gretel". Hags are often seen as malevolent, but may also be one of the chosen forms of shapeshifting deities, such as The Morrígan or Badb, who are seen as neither wholly benevolent nor malevolent. The word hag can also be synonymous for a witch.