sentences:  After Casimir left Lithuania for Poland, for more than 10 years Goštautas worked for Lithuania until in 1456 he attempted to remove his King and Duke Casimir IV Jagiellon from the Duchy throne in favor of prince of Kiev Simeon Olelkowicz, but he failed and died two years later in 1458.However his son, Martin Goštautas was named the voivode of the newly created (upon death of prince Olelkowicz) Kiev voivodeship in 1471.Jonas was the son of Andrius Goštautas and NN Buczacka h. Abdank (daughter of Michał Awdaniec z Buczacza h. Abdank and Małgorzata Koła h. Junosza.