Martha Leijonhufvud, Swedish noble (d. 1584)
Martha Eriksdotter Leijonhufvud (24 December 1520 in Ödeby Lillkyrka, Ekeberg, Närke – 15 January 1584 in Stegeholm), known as Kung Märta (lit. 'King Martha'), 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.