SIMON de Lorraine, son of THIERRY II Duke of Lorraine & his first wife Hedwig von Formbach (-[13/15] Jan 1139, bur Stürzelbronn). The Genealogica ex Stirpe Sancti Arnulfi names "Symonem ducem" as son of "Theodericum ducem"[35]. According to Europäische Stammtafeln[36], Duke Simon was the son of his father's first marriage. Poull[37] refers to several sources which apparently indicate that he was the son of Duke Thierry II's second marriage, including Duke Simon's own act dated 11 Apr 1126 which refers to his deceased "mother Gertrude". However, Duke Simon married "his stepmother's daughter whom she had by her first husband Graf Heinrich"[38], which is best interpreted as meaning that he married the daughter of Gertrude de Flandre, second wife of Duke Thierry II, by her first husband. The alternative interpretation, that Duke Simon (assumed for the purposes of this argument to be the son of Gertrude de Flandre) married the daughter of Hedwig von Formbach by an otherwise unknown first husband "Graf Heinrich" presents major chronological difficulties. Such a daughter could not have been born later than 1072 at the latest. Considering that Hedwig gave birth to two children by her husband Gerhard von Süpplingenburg who died in 1075, such a birth date appears incompatible with Duke Simon's wife having given birth to at least seven children, even if their marriage took place as early as [1112/13] as suggested by Poull. Two further sources confirm that Duke Simon was born from his father's first marriage. Firstly, the Gesta Alberonis Archiepiscopi names "Lotharingiæ ducem Symonem, fratrem regis [=Lothar von Süpplingenburg]" when recording his excommunication 10 Apr 1132[39], Emperor Lothar being Simon's uterine half-brother assuming that Hedwig von Formbach was his mother. Secondly, "Teodericus dux Lotharingie" donated the church at Nancy to the abbey of Molesme with the consent of "filio suo Simone" by charter dated to [1080/90][40] which, assuming this dating is correct, was before the date of Duke Thierry's second marriage. He succeeded his father in 1115 as SIMON I Duke of Lorraine. He founded the Cistercian monastery of Sainte-Marue-au-Bois at Stürzelbronn. The necrology of Notre-Dame aux Nonnains records the death "15 Jan" of "Symon dux Lotaringeris"[41]. The necrology of the abbey of Saint-Denis records the death "XIX Kal Feb" of "Simon Lotaringorum dux"[42]. The necrology of Gorze records the death "XIX Kal Feb" of "Simon dux Lotharingiæ"[43]. The Obituaire de Saint-Mansuy records the death "14 Jan" of "Sigismundus dux"[44].
m ([1112/13]) ADELAIDE de Louvain, daughter of HENRI III Comte de Louvain & his wife Gertrude de Flandre (before 1095-4 Nov after 1158). Simon Duke of Lorraine married "his stepmother's daughter whom she had by her first husband Graf Heinrich"[45]. In light of the chronological difficulties of this having been a daughter of Duke Thierry II's first wife, it is likely that Duke Simon's wife was the daughter of the comte de Louvain, whose wife married Duke Thierry as his second wife. Her name is confirmed by the charter dated 1155, after 1 Sep, under which "Judit Romaricensis ecclesie abbatissa" donated property at the request of "Aledis mater ducis Mathei"[46]. After the death of her husband, Adelaide retired to the Cistercian abbey of Notre-Dame du Tart, near Dijon[47].
Duke Simon I & his wife had [eight] children