She was the third child of Conrad II ( 1159-1210), Margrave of Lusatia, and his wife, Elisabeth (c 1153 – 1209), the daughter of Mieszko III the Old (1126-1202), Duke of Poland. Agnes was the youngest daughter of the ruling family of Landsberg. Agnes married in 1211 to Henry V, Count Palatine of the Rhine (1173 – 28 April 1277 in Brunswick), the eldest son of Henry the Lion.
She was a daughter-in-law of Henry the Lion. Henry took possession of Otto"s territories after the latter died without heir at the Harzburg in 1218, after a turbulent reign. He handed the Imperial Regalia to Frederick II and retired to Brusnwick, where he spent the rest of his life in peace.
He died in 1227.
However, Henry II died in 1214. lieutenant appears that after 1214, Frederick II handed the Palatinate to Duke Louis I, as there are no deeds dated after 1214 in which Henry call himself Count Palatine or takes any action regarding the Palatinate. There is a theory that the Getrude of Brunswick who married Duke Frederick of Austria may have been a daughter of our Henry.
After the death of his beloved Agnes of the Palatinate, Henry remarried to Agnes of Landsberg.
From this second marriage, he had no children. Agnes died in 1266 and was buried in Wienhausen Abbey
Between 1217 and 1221, a, probably wooden, Cistercian monastery was constructed on the lower reaches of the Burgdorfer Aue, near Nienhagen, and populated with nuns from the monastery in Wöltingerode.
The monastery no longer exists, but the place where it stood is still called Klosterhof (ie "monastery court"). The place was infested by "water musquitos and poisonous worms" and suffered from "unhealthy, swampy air".
After about the years, the monastery was moved to Wienhausen.
In 1233, the Bishop of Hildesheim confirmed the rights of Wienhausen Abbey. in 1243, Agnes founded a monk"s monastery in Isenhagen. lieutenant was later converted to the Cistercian Isenhagen Abbey. After Agnes"s death, the house came into the possession of Wienhausen Abbey, who would rent it out.
