The Genealogica ex Stirpe Sancti Arnulfi names "Symonem ducem" as son of "Theodericum ducem". According to Europäische Stammtafeln, Duke Simon was the son of his father's first marriage. This appears to be confirmed by the charter dated 10 Oct 1091 under which Pibon Bishop of Toul granted privileges to the monastery of Toul Saint-Léon and named "dux Theodericus et Simon puer eius filius, et frater ducis Gerardus comes et Renardus comes Tillensis". Poull 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", 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 Archiep iscopi names "Lotharingiæ ducem Symonem, fratrem regis [=Lothar von Süpplingenburg]" when recording his excommunication 10 Apr 1132, 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] which, assuming this dating is correct, was before the date of Duke Thierry's second marriage. “Theodoricus...Lotharingorum princeps, dux et marchio” donated “quidquid continetur a rivo de Grimommont usque ad nemus de Granviller et usque ad nemus de Stivay” to Saint-Dié, at the request of “Hugonis de Distorchio”, in the presence of “suorum filiorum...Simonis, Theodorici, Gerardi, Henrici”, by charter dated 19 Mar 1114.
He succeeded his father in 1115 as SIMON I Duke of Lorraine. “Duci Simoni, comiti Odvino, Alberto de Darney et Simoni advocato” granted rights to Saint-Dié by charter dated to [1123/25]. "Simon...dux Lotharingiæ et marchio" donated “ecclesiam...de Pixerecourt...partem decimarum villæ...de Margeville et Augecourt” to the abbey of Bouxières-aux-Dames, in the presence of “soror mea domina Hara abbatissæ”, by charter dated 30 Mar 1130. “Simon...Lotharingorum dux” renounced claims over property of “ecclesia de Sancti-Remigii-Monte”, brought by “patris mei beatæ memoriæ ducis Theodorici”, with the support of “uxore mea...ducissa Adelide...cum Matthæo...unico nostro filio”, by undated charter.
He founded the Cistercian monastery of Sainte-Marue-au-Bois at Stulzbron.
The necrology of Notre-Dame aux Nonnains records the death "15 Jan" of "Symon dux Lotaringeris". The necrology of the abbey of Saint-Denis records the death "XIX Kal Feb" of "Simon Lotaringorum dux". The necrology of Gorze records the death "XIX Kal Feb" of "Simon dux Lotharingiæ". The Obituaire de Saint-Mansuy-lès-Toul records the death "14 Jan" of "Sigismundus dux". 1
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