Seigneur William de Dampierre
William was born about 1195 in France.  He died on September 3rd, 1231.

 Margaret I of Hainault & Flanders
Margaret was born on June 2nd, 1202 in Constantinople, Constantinople, Turkey.  She died at the age of 77 on February 10th, 1280.

 Count Guy de Dampierre
Guy was born about 1226.