Doyle's grandfather (or father)

Doyle's grandfather (or father) was a phouka who bred in his dog form with a Hellhound of the wild hunt. He survived the encounter. He could shapeshift at least to a dog form and horse form.

Upon learning that Doyle's predecessor was able to shapeshift to a horse form, Queen Andais expresses her regret that she never had sex with Doyle and says she will remedy it if Doyle doesn't get Meredith pregnant.

According to Queen Andais in A Caress of Twilight it was Doyle's grandfather. Doyle also speaks of him as his grandfather.

According to Hettie in Swallowing Darkness it was Doyle's father.