According to tradition, Margaret was engaged to Svante Sture when the king decided to marry her, but her family broke the engagement and her former fiancé was married to her sister, Martha Leijonhufvud, instead. A story describes how her sister's marriage came about. According to tradition, the king caught his new queen and her former fiancé together alone, with the young man, Svante Sture, on his knees before the queen. The king reportedly asked in a rage: "What is this?!" upon which Queen Margaret swiftly answered: "My Lord Sture is asking me for the hand of my sister!" At this, the king just as swiftly answered: "Granted!"