Sybilla of Henao 1179 - 9 Jan 1217 Parents Baldwin V, Count of Hainaut Margaret I, Countess of Flanders Children Agnes of Beaujeu Sibylle de Beaujeu Humbert V de Beaujeu Guichard de Beaujeu, Lord of Montpensier Siblings Isabella of Hainault Eustace of Flanders Yolanda of Flanders Henry of Flanders Baldwin I of Constantinople Philip I of Namur Partners Guichard IV of Beaujeu