Who is Llewelyn ap Gruffydd from Falls the Shadow and what is their importance?

Llewelyn ap Gruffydd is the son of Gruffydd, Llewelyn Fawr's son. He has been feuding with his father since learning that Llewelyn Fawr would be leaving his lands and title to his younger son, Davydd. As a result, Gruffydd is deeply angry at his father. Llewelyn, however, has lived with his grandfather for many years because of his father's imprisonment at Dangwy. This has caused a close relationship between Llewelyn and his grandfather.

As Llewelyn grows up, he finds himself on the outs with his own father as he continues to embrace his grandfather's philosophy on life. However, when Davydd, Llewelyn Fawr's heir, imprisons his father and brother, Llewelyn finds himself forced to defend his family. In the end, however, Llewelyn chooses the side of Wales. Llewelyn is made Davydd's heir and becomes Prince of Wales. As Prince of Wales, Llewelyn brings Wales together in a way even his grandfather never did.