OTTO von Schweinfurt, son of HEINRICH Graf von Schweinfurt Markgraf auf dem Bayerischen Nordgau & his wife Gerberga [von Hammerstein] (-28 Sep 1057, bur Schweinfurt). The Annalista Saxo names "Otto marchio de Suinvorde" as son of "marchionis Heinrici et Gerberge marchionisse", when recording his appointment as Duke of Swabia[929]. Graf an der unteren Altmühl 1014. Markgraf auf dem Nordgau 1024-1031. Graf an der unteren Naab 1034. Graf an der oberen Naab 1040. He succeeded in 1048 as OTTO Duke of Swabia. The Annalista Saxo records the death of "Otto de Suinvorde dux Suevorum" on "IV Kal Oct" and his burial in Schweinfurt[930].
[931]Betrothed (18 May 1035, contract broken 1036) MATYLDA of Poland, daughter of BOLESLAW I "Chrobry/the Brave" King of Poland & his fourth wife Oda von Meissen (-[1036]). This betrothal was broken by the council of Tribur in 1036, presumably on the grounds of consanguinity[932]. The Annalista Saxo records the end of the betrothal with "Machtildem" but does not give her origin[933].
m (1036) as her first husband, IRMGARD [Aemilia/Immula] di Susa, daughter of MANFREDO UDALRICO Marchese di Susa and Turin & his wife Berta degli Obertenghi (-1078 before 29 Apr). The Annalista Saxo names "Emilias vel Immula seu Irmingardis" as wife of Otto von Schweinfurt and sister of "Adelas [uxor] Ottoni marchioni de Italia"[934]. She married secondly (1058) Ekbert I Graf von Braunschweig Markgraf von Meissen (-11 Jan 1068), although the primary source which confirms this second marriage has not yet been identified.
Markgraf Otto & his wife had [six] children