Read about the further adventures of Pryderi and Rhiannon in the third branch of The Mabinogion. The two get abducted, but eventually come home safely. Whew.
This text includes the first branch of The Mabinogion, which dishes on all of the dirty details of Pwyll's life. That includes all of his family, including our girl Rhiannon.
Lady Charlotte Guest brought Welsh stories into the nineteenth century. She tells of Rhiannon, Pwyll, and Pryderi, and all their juicy family angst.