sentences:  Death of Sigismund Kęstutaitis left empty the throne of the Grand Duchy of Lithuania and Jonas Goštautas, as well as other noblemen of the Council of Lords supported Casimir Jagiellon as a candidate for the throne.Polish magnates hoped and insisted that thirteen-year-old boy remained only a vicegerent of Wladyslaw III, the Polish King and his brother, in Lithuania.But when Polish delegation bringing Casimir arrived in Vilnius in 1440 he was proclaimed as Grand Duke by the Council of Lords, contrary to the wishes of the Polish politicians—an act supported and coordinated by Jonas Goštautas.