ENGELBERT [III] de Brienne, son of ENGELBERT [II] de Brienne & his first wife Wandelmodis --- (-1035 or after). A manuscript genealogy, dated to the early 12th century, records "Letaldus comes Vesoncius et Umbertus comes Marisconensis fratres", adding "ex Umberto, Adala comitissa, ex Adala Windesmodis soror matris vestræ non german, ex Windesmode Ingelbertus et Witdo de Upione"[317]. "Ingelbertus…comes" donated property to Montiérender by charter dated [1027] "actum Breona castello" in which he names "quondam Ingelbertus comes predecessor noster", subscribed by "Adeledis comitisse, Wuarneri, Gocelmi, Guntardi, Bernard"[318], although "Adeledis comitisse" has not been identified. It is possible that she was an earlier wife of Comte Engelbert [III]. This source does not specify that Engelbert's predecessor was his father, but the primary source which confirms his parentage has not yet been identified. Comte de Brienne. 1035.
m PETRONILLE, daughter of --- (-after 6 Jun 1050). "Comes Breonensium Gualterus cum matre sua Petronilla" donated property to Montiérender by charter dated 28 Dec 1035[319], presumably following the death of their father/husband although this is not stated in the document. "Comite Waltero et matre eius Petronilla" are named as present in a charter dated [12 Jun 1050 or before] under which "Bosoni iuvenis" donated property to Montiérender, naming "pater eius Elbertus"[320]. "Walterus comes Brenensis…mater mea Petronilla" donated property to Montiérender by charter dated 6 Jun 1050, subscribed by "Letaldi comitis Cereaci"[321].
Comte Engelbert [III] & his wife had one child