• Born: 1175, Flandres, Belgium
• Married: 1 Jul 1193, Soissons, Aisne, Picardie, France
• Died: 26 Aug 1219, Constantinople, Byzantium

  Research Notes:

The Chronicle of Alberic de Trois-Fontaines in 1191 names "Elizabeth Francie reginam…Hyolenz uxorem Petri Autisiodorensis et Sibiliam domnam Bellioci uxorem Wichardi" as the three daughters of "Balduinus [Haynaco]". The Chronicon Hanoniense records the marriage in 1181 of "Yolandem Balduini comitis Hanoniensis filiam" and "Henricus primus comitis Campanensis filius", but this was presumably only a betrothal as such a marriage is unrecorded elsewhere. The Chronicle of Alberic de Trois-Fontaines names "Hyolenz…soror comitis Philippi Namucensis" as wife of "comes Petrus Autisiodorensis", specifying that her husband became Comte de Namur by right of his wife. The Historia Episcoporum Autissiodorensium records that Pierre married "Yolandam sororem Henrici Constantinopolitani Imperatoris" as his second wife after the death of "Agnete uxore sua".

She succeeded as YOLANDE Marquise de Namur in 1213. She was crowned Empress of Constantinople with her husband by the Pope 9 Apr 1217 at Rome. She was appointed regent of the Latin Empire of Constantinople after arriving there safely by sea in 1217, in the absence of her husband whose fate at that time was unknown. She was able to stop the attacks of Theodoros Emperor in Nikaia, and arranged his marriage to her daughter Marie to seal the peace which was agreed. ¹