Simon of Dammartin

Simon of Dammartin (c. 1180–1239) was count of Aumale and Ponthieu. He received Aumale from Philip II Augustus in 1206 and married Marie, heiress of Ponthieu. He joined King John of England and fought at Bouvines in 1214; defeated, he fled into exile and his lands went to Philip Hurepel.

In 1223 he seized Abbeville to reconquer Ponthieu, but Louis VIII drove him out. His wife obtained Ponthieu's restoration on harsh terms, including the surrender of Doullens and Saint-Riquier. Simon accepted these terms in 1230 and recovered Aumale in 1234. He died in 1239.