Alberic III of Dammartin

Alberic III of Dammartin (c. 1135–1200) is first recorded as count of Dammartin in a charter of 1162, confirming the possessions of Chaalis Abbey. In 1165 he married Mahaut, heiress of Clermont.

Serving Philip Augustus, he led a mission to the English king in 1180 and fought Philip of Flanders, who captured him at Dammartin in 1182.

Around 1187 he transferred to Henry II of England, receiving the Norman fief of Lillebonne. He later supported John Lackland against Philip Augustus, died at Lillebonne in 1200, and was buried at Jumièges Abbey. His sons Renaud and Simon both became counts.