Lady Myrianne Mercer, née Droft, is a recurring character in the fourth, fifth, and sixth seasons. She is the wife of Lord Eddin Mercer and the lady of Dunharrow. She is the mother of Roman, Grayson and Celesse Mercer. She is originally from House Droft of Kell, and is the younger sister of Lord Kyllan Droft.
Despite being 15 years younger than her husband, the two share a loving and happy marriage.