Question: When is Laufey Valdimarsdóttir's mother's birthday?
Sentence (from "Bríet Bjarnhéðinsdóttir"): Bríet Bjarnhéðinsdóttir (September 27, 1856 – March 16, 1940) was an early Icelandic advocate for women's liberation and women's suffrage.
Relevant evidence: Yes