AGNES ([Summer 1072/early 1073]-24 Sep 1143, bur Klosterneuburg). The Gesta Friderici of Otto of Freising records the marriage of "filiam unicam" of King Heinrich IV and "Fridericus dux Suevorum", naming her Agnes in a later passage[429]. In a subsequent passage, the Gesta records the second marriage of Agnes to "Leopaldo Orientali marchioni"[430]. The Continuatio Claustroneoburgensis records the marriage of "Liupoldus marchio Austrie" and "Agnetem imperatoris Heinrici IV filiam", specifying that the couple had seven children who died in infancy and eleven who survived into adulthood, six sons and five daughters[431]. The marriage presumably took place early in the year if it is correct, as stated by Haverkamp, that it was arranged by Agnes's brother, the future Emperor Heinrich V, to obtain her future husband's support for his rebellion against their father[432]. The Auctarium Mellicense records that Agnes, wife of "Leopoldus marchio", gave birth to 18 children[433]. The Annales Magdeburgenses record the death in 1143 of "Agnes marchionissa mater Cuonradi regis"[434]. The necrology of Nonnberg records the death "VIII Kal Oct" of "Agnes marchionissa"[435]. The necrology of Kloster Neuburg records the death "VIII Kal Oct" of "Agnes marchionissa fundatrix h e"[436]. m firstly (betrothed Regensburg 24 Mar 1079) FRIEDRICH I Duke of Swabia, son of FRIEDRICH von Büren & his wife Hildegard ([1050]-1105 before 21 Jul). He built the castle of Stauf near Göppingen from which the family eventually took its name. m secondly ([early] 1106) as his second wife, LEOPOLD III "der Heilige" Markgraf of Austria, son of LIUTPOLD II Markgraf of Austria & his wife Ida von Ratelberg ([1075]-killed while hunting 15 Nov 1136, bur Stift Klosterneuburg (-15 Sep 1136, bur Klosterneuburg).