D

Dagda (Daghda, Dagde, Dagodevas): The Irish-Celtic god of the earth and treaties, and ruler over life and death. Dagda, or The Dagda, ("the good god") is one of the most prominent gods and the leader of the Tuatha Dé Danann. He is a master of magic, a fearsome warrior and a skilled artisan. Dagda is a son of the goddess Danu, and father of the goddess Brigid and the god Aengus mac Oc. The Morrigan is his wife. His attributes are a cauldron with an inexhaustible supply of food, a magical harp with which he summons the seasons, and an enormous club, which can kill as well as restore men to life. One of his epithets is Ollathir, which means "All-father". He is identified with the Welsh Gwydion and the Gallic Sucellos.

Damona: A Gallic goddess, known as the "Divine Cow". She is the spouse of Borvo.

Danu (Dan, Dana, Dann): The Irish/Celtic earth goddess, matriarch of the Tuatha Dé Danann ("People of the goddess Danu"). Danu is the mother of various Irish gods, such as the Dagda (also mentioned as her father), Dian Cecht, Ogma, Lir, Lugh, and many others. Her Welsh equivalent is the goddess Don.

Dea Matrona: The Celtic deity at the source of the river Marne (northeastern France).

Dea Sequana: The Celtic deity at the source of the river Seine (northern France).

Deirdre: In Irish Gaelic literature, folklore, and mythology, a legendary heroine. Deirdre, who was renowned for her beauty, was brought up by Conchobar, King of Ulster, who planned to marry her. However, she fell in love with his nephew Noíse and they fled to Scotland, accompanied by his two brothers. Emissaries of the king induced them to return to Ireland, and when they did, Conchobar had the three brothers treacherously killed. Deirdre then died of grief. This story is told in the Ulster Cycle and inspired many later playwrights, poets and writers, such as William Butler Yeats, and forms the basis of J. M. Synge's play Deirdre

Dewi: An old Welsh god. The official emblem of Wales, a red dragon, is derived from the Great Red Serpent that once represented the god Dewi.

Dian Cecht: The great god of healing and the physician of the Tuatha Dé Danann. He made the silver hand for his brother king Nuada to replace the one he lost in battle. Dian Cecht had blessed the well Slane in which the wounded Tuatha Dé bathed. It healed all their wounds so they could resume their fighting. He had a son, Miach, whom he slew out of professional jealousy. Miach had replaced the silver hand Dian Cecht had made for Nuada with Nuada's own hand. Some claimed it was jealousy, while Dian Cecht said is was the disrespectful manner in which the replacement was done. He is also the grandfather of Lugh.

Dis: The name Caesar gave to the supreme god of the Celts he encountered in Gaul. It is uncertain which Celtic deity this refers to.

Don: The Welsh mother-goddess. She is the wife of Beli, and mother of Gwydion. Her Irish counterpart is Danu.

Dwyn (Dwynwen): The Celtic god of love.

Dylan: Dylan ("sea"), a virgin-born son of Arianrhod. He was a sea-creature, and returned to the waves. Much later, he came back upon land and was killed by his own uncle Govannon, who did not know who he was.

E

Edain: The Celtic goddess who is associated with horseback-riding. She isprobably equivalent to the Gaulish goddess Epona.

Epona: The ancient Gaulish goddess of horses, mules, and cavalrymen. She was worshipped throughout entire Gaul, and as far as the Danube and Rome. Her cult was eventually adopted by the Roman army and they spread her worship wherever they went. Epona is depicted sitting or lying on a horse, or standing with multiple horses around her. Her symbol is the Cornucopia ("horn of plenty") which suggests that she could (originally) have been a fertility goddess. She is also identified with the Celtic goddess Edain

Eriu: An Irish/Celtic goddess, the personification of Ireland. She belongs to the Fomorians and is the mother of Bres, king of Ireland. The name Ireland comes from her name (Eyre, Eire, or Eiriu). Esus (Hesus): "Lord" or "Master". A Celtic agricultural deity of the Essuvi (Gaul), who derived their name from him. His cult was associated with the bull (with three skulls) and he is portrayed with one. He is also represented cutting branches from trees with an axe. According to some he was a bloodthirsty god, while other regard him as a god of commerce (similar to Mercury). His consort is Rosmerta.