Davos Dayne

Ser Davos Dayne is an unseen character in Game of Thrones. He was the third husband of Princess Nymeria.

Biography
Although Davos was husband to Nymeria, it was the Princess herself who held the true power between the two of them, with Davos being little more than a councillor and consort. The son they had did not succeed Nymeria, as the Dornish rules of succession were gender-neutral.

Reference

 * "Dorne (Histories & Lore)"