 Maria's brother-in-law, Alexander I, nevertheless maintained friendly relationships with the Grand Duchy of Lithuania and his daughter Uliana married Algirdas, the son of Gediminas, who continued the Gediminid line.The cooperation between Lithuania and Tver lasted well into the 15th century.Aldona (baptized as Ona or Anna; her pagan name is known only from the writings of the 16th century chronicler Maciej Stryjkowski) married Casimir III of Poland, son of Władysław I of Poland, when he was 15 or 16 years old.