Principality of Halych
Queen Gertrude showed blatant favoritism towards her German relatives and courtiers, causing widespread discontent among the native lords. Taking advantage of her husband's campaign in the distant Principality of Halych, a group of aggrieved noblemen seized and murdered her in the forests of the Pilis Hills on 28 September 1213. King Andrew only punished one of the conspirators, a certain Count Peter, after his return from Halych. Although Béla was a child when his mother was assassinated, he never forgot her and declared his deep respect for her in many of his royal charters.