She acted as regent of Flanders from 1096 until 1100, while her spouse was on crusade, and in the name of their son Baldwin VII from 1111 until 1119.
"[2] Because her dower contained so much land and so many towns, it created the opportunity for Clementia to build relationships with the people, which further allowed her to become the "patron of various monasteries, [to] develop bonds of friendship with important families, and help spread comital influence throughout the area.
When her husband, Count Robert II, left to go on the First Crusade in 1096, Clementia became regent of Flanders.
Lambert of Arras enshrined them at the priory of Watten in attendance of Clemence and other Flemish nobles.
[5] They ruled together with relative peace, until Baldwin VII began to form a stronger bond with his cousin Charles of Denmark.
She lost the battle to Charles when he captured four of her dower towns, which led to the cutting off of resources for her army.