The Táin has a long, unrecorded oral history, but some of the tales began to be written down around the 7th century. Although the overall epic is mainly about a war between the king of Ulster and Queen Medb of Connacht over thebull Don Cuailnge, the hero of the story is the demigod Cu Chúlainn. In this specific project, the main focus was on his birth tale, where Deichtine would be magically impregnated by the god Lug and birth Cu Chúlainn. Although there is no romance involved, as what occurs to Deichtine happens in only a few pages, it does show how she becomes a vessel for going from point A to point B within the story, and provides an early example for a sacirifcal mother of the "golden child" of prophecy so frequently seen in literature. 

The picture attached is "Cuchulain Desires Arms of the King", a scene from The Táin.