Born in Gondor to Lord Therin Tiff and Lady Eleina Tiff he was born alongside his twin sister and after his brother, during his early days Thannas was always trying to prove himself better than his brother he trained to fight to the point he did it almost all the time in the free time he had he grew a strong bond with his twin sister and they became best friends during his seventeenth year he gave up trying to beat his brother and began drinking, bedding women and brawling becoming quite infamous to the guards and innkeepers alike.

During his later years he formed a rivalry with a fellow house by bedding their eldest daughter and falling in love with her the elders of each family stopped the relationship however before it was too late. later on the girls brother forced his sisters maidenhood from her, the very same day Thannas killed the boy and earned his exile wandering Eriador ever since and becoming a man for hire.