Eustache de Hainaut, de Flanders

-http://fmg.ac/Projects/MedLands/FLANDERS,%20HAINAUT.htm#Eustachedie...

7. EUSTACHE de Hainaut (-after 1217). Villehardouin names "the Emperor's brother Eustache" when recording that Emperor Henri sent him "across the straits to Spiga" after a truce was agreed with Theodoros Laskaris[544]. Military commander 1206/1209. Regent of the kingdom of Thessaloniki 1210/16.

m (betrothed [Jun/Jul] 1209) --- Angelina, daughter of MIKAEL Komnenos Dukas [Angelos] Lord of Epirus & his [first wife --- Melissene]. The primary source which confirms her parentage and marriage has not yet been identified. Her marriage was arranged by her father to seal his alliance with the Latin Empire of Constantinople[545]. It is assumed that she was the daughter of Mikhael's first marriage in view of the date of her betrothal, although it is not impossible that she was still an infant at the time and therefore born from his second marriage.