Ecne
In Celtic mythology, Ecne was one of the Tuatha Dé Danann and was the god or goddess of wisdom.
Ecne is generally presumed to be the grandson of the goddess Ana/Anu who conceived Ecne after being impregnated by her three sons.
Ana's three sons may have been Brian, Iuchar, and Iucharba, who were sons of Tuireann, aka Delbáeth. Thus Ecne's three fathers were perhaps these brothers Brian, Iuchar, and Iucharba. Since the brothers were sired by Tuireann/Delbáeth upon his own daughter Danand, the brothers too were born out of an incestual relationship. The brothers are called the tri dee Donand, meaning the three gods of Danu, which can also be read as the three gods of dán, or knowledge. Related attributes are personified as their descendants, and Wisdom is the daughter of all three.
For Ecne to be the daughter of three brothers also recalls the early Celtic practice of fraternal polyandry.
Ecne's three fathers killed Cian, the father of Lugh, and Lugh's deadly revenge is recounted in Oidheadh Chlainne Tuireann.
In Irish Druids and Old Irish Religions, James Bonwick reports Ecne as female and as the goddess of poetry.