Question: Who was the second wife Sigismund I the Old, the King of Poland and Grand Duke of Lithuania and mother of Anna Jagiellon?
Sentence (from "Lithuanian Civil War (1389–92)"): Over the next two years it became clear that neither side could achieve a quick victory, and Jogaila proposed a compromise: Vytautas would become Grand Duke and Jogaila would remain Superior Duke.
Relevant evidence: No