In what year was the mother of Karigaila born?
Karigaila: Karigaila (Polish: "Korygiełło" , died on 16 September 1390 in Vilnius) was a son of Algirdas, Grand Duke of Lithuania, and his second wife Uliana of Tver. Uliana of Tver: Uliana Alexandrovna of Tver (Russian: Ульяна Александровна Тверская ;  1325 – 17 March 1391) was a daughter of Prince Alexander of Tver and Anastasia of Halych (daughter of Yuri I of Galicia).
1325