Question: When did Sigrid Sture's mother die?
Sentence (from "Martha Leijonhufvud"): Martha Erikdotter Leijonhufvud (24 December 1520 in Ödeby Lillkyrka, Ekeberg, Närke – 15 January 1584 in Stegeholm), known as "Kung Märta" (King Martha), was a politically active Swedish noble.
Relevant evidence: Yes