Elen:

In the Mabinogian, the Welsh mythic epic, this heroine appears as the world's first highway engineer. When her land was threatened, she magically built highways across the country so that her soldiers could gather and defend it.

The Trinity (Love Knot):

One of the basic Celtic designs. The circles represent the three domains of ancient Celtic belief: the underworld for the past, the earth world for the present, and the sky world for the divine