Seaghd II mac Greimdorch (currently posing as his "great-grandson", Seaghd IV mac Greimdorch) is the incumbent head of House mac Greimdorch and current owner of Castle Fitheach. What those outside of his own household do not know, however, is that he is a Vampire and has been for well over five centuries after using a blood ritual to give himself the virus that involved killing his younger brother, Coman. He keeps this fact hidden by taking advantage of the Empire's lack of upkeep on birth and death records to hide his identity, changing his appearance every generation or so to match his new name, and subtly manipulating the political structures of Tir to try and increase his personal power.
Despite his personal aspirations of attaining absolute power for himself, he himself tends to keep to the shadows, using a vast army of peons to do his bidding for him and even using a Scrying Unknown as a stand-in at Imperial Council of City Governors meetings, speaking through it.
Seaghd is known, however, to have three wives and be a lover of the arts, particularly poetry and portraiture. The rare times he appears in public he is usually dressed in dark colours with white or red accents, and carries an heirloom parasol (with a rapier concealed in the handle) with the mac Greimdorch coat of arms on the fabric.