In the Year of God 890, the duchy was held by Lord Kahlvyn Ahrmahk, a first cousin of King Haarahld VII and son-in-law of Rayjhis Yowance, Earl of Gray Harbor. However, after the Duke was revealed to be a traitor by Merlin Athrawes, he died in a struggle by the hand of his father-in-law.
Known Dukes of Tirian Edit
- Lord Ahryn Ahrmahk, Duke of Tirian
- Lord Kahlvyn Ahrmahk, Duke of Tirian ( – YOG 890 )
- Lord Rayjhis Ahrmahk, Duke of Tirian ( YOG 890 – )