Rotrou IV, Count of Perche

He joined Louis VII of France in a war against Henry II of England, in which he lost lands to the English.

[2] Upon the death of his father in 1144, Rotrou continued the fight against his archenemy, William III Talvas, Count of Ponthieu and Lord of Alençon.

Aside from this long-running blood feud, his uncle Patrick had married William Talvas' daughter Adela.

His mother Hawise and her second husband, Robert I of Dreux, served as regents at Perche until he reached the age of maturity.

Rotrou aided Louis VII the Younger against Henry II of England in an ineffective war that saw their troops routed, lands ravaged and property stolen.