Background
She was the daughter of Henry V, Count Palatine of the Rhine, who was also duke of Brunswick, and his wife, and his wife Agnes of Hohenstaufen.
She was the daughter of Henry V, Count Palatine of the Rhine, who was also duke of Brunswick, and his wife, and his wife Agnes of Hohenstaufen.
She brought the city of Pforzheim into the marriage. Her paternal grandfather was Henry the Lion. In 1245, Irmengard founded Lichtenthal Abbey in Lichtental (now part of Baden-Baden, where later the Margraves of Baden would be buried.
In March 1245, she was given several manors and rights.
In this case, the brothers gave away more than they owned, because they had earlier enfeoffed Louis of Liebenzell with two parts of the tithes. This led to a length dispute.