Martha Eriksdotter Leijonhufvud (24 December 1520 in Ödeby Lillkyrka, Ekeberg, Närke – 15 January 1584 in Stegeholm), known as (), was a politically-active Swedish noblewoman. She was the sister of Queen Margaret Leijonhufvud and sister-in-law of King Gustav I of Sweden: she was also the maternal aunt of Queen Catherine Stenbock and the daughter-in-law of the regent Christina Gyllenstierna. In 1568, she financed the deposition of King Eric XIV of Sweden, which placed her nephew John III of Sweden on the throne. Biography Marriage Born to Erik Abrahamsson Leijonhufvud (d. 1520), a victim of the Stockholm Bloodbath, and Ebba Eriksdotter Vasa, and relative of Gustav Vasa, who became king of Sweden in 1523. Her sister Margaret was engaged to Svante Stensson Sture, the son of former regent Christina Gyllenstierna, but the engagement was broken in 1536 when king Gustav decided to marry her. Instead, Sture was married to Märta. There is a well known legend as to how this came about: Svante Sture threw himself at the feet of Margaret, and the king entered the room and discovered them. The king asked: "What is this?" Margaret replied: "My lord Sture is asking me for the hand of my sister Märta!", at which the king said: "Granted!" Martha and Svante Stensson Sture were married 3 March 1538 at Nyköping Castle. By marriage, she became the wife of the head of the most powerful family in Sweden after the royal family, as Svante Sture was considered the highest ranking nobleman in the realm, and in addition to being the sister of the queen, she became one of the highest ranking women in Sweden next after the royal women. King Martha Märta had at least fifteen children, of whom ten lived to adulthood. She and Sture resided in Stegeborg Castle. In 1542, Stegeborg was besieged by Nils Dacke during the Dacke War, and Dacke offered the couple to become the king and queen of Sweden. They denied the offer. Svante was often absent on his official missions: he became marshal in 1543 and commander in Finland in 1556, and governor of Livonia and Reval in 1562. During his absence, Märta took the responsibility for Stegeborg and his estates, and her dominance earned her the nickname King Märta, by which she is known in history. As such, she is known to have exerted her authority in the justice system in her fiefs and appointing