Gods of Celtic Mythology
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Morrigan

Morrigan is the Mother of all Celtic gods. She has many forms and shapes. Some of the mythological scholars mistook her for three different gods. She used to be thought of as a war goddess, but the truth is that she actually wants the wars to end.
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Aonghus

Aonghus is the Celtic god of love. He took up his father's craft playing the harp. He is also called Aenghus, Oenghus, and Mac-Og.
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Danu

Danu is the celtic goddess of the wind, wisdom, and fertility. Tuatha-De-Danann was the group of "lesser gods" that followed Danu.
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Dagda

Dagda is the leader of the Tuatha-De-Danann. He is the god of life, death, war, banquets, and magic. He carries a club so big it has to be carried on a cart.
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Cuchulainn

Cuchulainn performed all manners of manly heroic deeds, wielding his Gae-Bholg: a spear. Whenever it stabbed a body, thirty barbs opened up, causing incurable damage.
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Brigit

Brigit was the Celtic goddess of Poetry, Healing, Smith craft and Martial Arts. The daughter of Dagda, she was obviously nicknamed by the Christians and turned into Saint Bridget.
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Cernunnus

Cernunnus has antlers and runs around with wild animals. He is also known as Herne the Hunter. He is worshipped in Great Britain.
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Arawn

Arawn is the Celtic god of the Otherworld. He is fond of taking his Hounds of Hell for a run to find lost souls. This causes people to stay away and exile the Otherworld.
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Abandinus

Abandinus is the Celtic river god. His name means "Defender of the Water." Only one shrine has ever been found.
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Tuatha-De-Danann

Tuatha-De-Danann is a group of Celtic gods. Most of the gods in the group were mentioned above.
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Resources: http://www.godchecker.com/pantheon/celtic-mythology.php