 Anna Throndsen is also known for her possible but much debated and disputed involvement in drafting some of the famous Casket Letters; these letters being the principal evidence against Mary.Anna was the eldest daughter of Kristoffer Throndsen, a famous 16th-century Norwegian admiral, nobleman and wartime privateer (pirate).During the final years of independent Norway, 1532–1536, Kristoffer served as admiral of the Norwegian fleet, in the service of his cousin, Olav Engelbrektsson, the last archbishop of Norway.