Marie I, Countess of Boulogne

Marie of Boulogne (1136–1182), also called Mary of Blois, was the youngest daughter of King Stephen of England and Matilda of Boulogne. Dedicated to the Church as a child, she became abbess of Romsey in the late 1150s.

When her brother William died in 1159, she inherited the County of Boulogne. In 1160 Matthew of Alsace removed her from her abbey and married her; the Church forced them to separate in 1169. She then returned to religious life, leaving two daughters, Ida and Matilda.