Analysis of information sources in references of the Wikipedia article "Incest in folklore and mythology" in English language version.
Donann the daughter of the same Delbaeth was mother of the three last, Brian, Iucharba and Iuchar. These were the three gods of Danu, from whom is named the Mountain of the Three gods. And that Delbaeth had the name Tuirell Bicreo.
Donann the daughter of the same Delbaeth was mother of the three last, Brian, Iucharba and Iuchar. These were the three gods of Danu, from whom is named the Mountain of the Three gods. And that Delbaeth had the name Tuirell Bicreo.