Anna Tronds (c. 1539–1607) or Anna Kristoffersdatter, known in English as Anna Throndsen and posthumously as Anna Rustung, was a Norwegian-Dano noblewoman, daughter of admiral Kristoffer Trondsson, a Danish-Norwegian admiral of Norwegian origin. In English and Scots history, Anna Throndsen is best known for her engagement to James Hepburn, 4th Earl of Bothwell[1] (which later earned her the nickname Skottefruen ("The Scottish Lady")), a man who later married Mary, Queen of Scots. Anna Throndsen is also known for her possible but much debated and disputed involvement in drafting some of the famous Casket Letters; from early 1567. These letters being the principal evidence against Mary. The probability that she was involved in the production of these letters is, however, minimal, as Anna, at least since 1565, was resident in her home country, Norway.