- Born: Between Jun 1072 and Mar 1073
- Marriage (1): Friedrich von Büren Herzog von Schwaben 1
- Marriage (2): Leopold III von Babenberg Markgraf von Österreich in 1106 1
- Died: 24 Sep 1143 1
- BuriedFem: Stift Klosterneuburg, Klosterneuburg, Niederösterreich, 3400, AT 1
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 III and "Fridericus dux Suevorum", naming her Agnes in a later passage. In a subsequent passage, the Gesta records the second marriage of Agnes to "Leopaldo Orientali marchioni". 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. 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 IV, to obtain her future husband's support for his rebellion against their father. The Auctarium Mellicense records that Agnes, wife of "Leopoldus marchio", gave birth to 18 children. The Annales Magdeburgenses record the death in 1143 of "Agnes marchionissa mater Cuonradi regis". The necrology of Nonnberg records the death "VIII Kal Oct" of "Agnes marchionissa". The necrology of Kloster Neuburg records the death "VIII Kal Oct" of "Agnes marchionissa fundatrix h e".
m firstly (betrothed Regensburg 24 Mar 1079) FRIEDRICH I Duke of Swabia, son of FRIEDRICH von Büren & his wife Hildegard (-1105 before 21 Jul).
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] (-killed while hunting 15 Nov 1136, bur Stift Klosterneuburg (-15 Sep 1136, bur Klosterneuburg). 1
Agnes married Friedrich von Büren Herzog von Schwaben.1 (Friedrich von Büren Herzog von Schwaben was baptised about 1050 and died before 21 Jul 1105.)
Agnes next married Leopold III von Babenberg Markgraf von Österreich, son of Leopold II von Babenberg Markgraf von Österreich and Ida, in 1106.1 (Leopold III von Babenberg Markgraf von Österreich was born between 1080 and 1086,1 died on 15 Nov 1136 1 and was buried in Stift Klosterneuburg, Klosterneuburg, Niederösterreich, 3400, AT 1.)