The Kayros title was the highest position in the Tarosian Kingdom and Tarosian Empire, mostly all of the Kayroses belonged to the Varros Clan.
Etymology
The title was named after the name of the Kayros the Great by high usage of his name instead of "high lord" making it more common. Was standardized by Kayros's successor - Auriel on the official level making it a title during RIse of Tarosian Kingdom.