Kyriakos

Kyriakos was Letha's husband and the first life of Seth Mortensen. He appears only in flashbacks.

Succubus Shadows
During Georgina's imprisonment by the Oneroi, she dreams about her wedding day with Kyriakos. He comes to visit her so he can give her a ring and they kiss passionately. They end up having sex before parting ways to get ready for the wedding. When Kyriakos shows up at the wedding, he accuses Letha of being a whore since they had sex and refuses to marry her. Georgina muses to herself that the dream was false, because they'd had sex for the first time on their wedding night and not before.

In another dream, Georgina dreams about when she shapeshifted back into her original body as Letha and returns to her hometown. Kyriakos is much older now and does not recognize Georgina, although she says that they've met before. He tells her that he never married and that his sister keeps house for him.

Towards the end of Succubus Shadows, it is heavily implied that Seth is Kyriakos' reincarnation. After Seth and Georgina make love, he sleepily calls her "Letha," Georgina's real name.