Sigismund Kęstutaitis [SEP] noble title
Sigismund Kęstutaitis
Sigismund Kęstutaitis (; ; c. 1365 – 20 March 1440) was the Grand Duke of Lithuania from 1432 to 1440. Sigismund was his baptismal name; Sigismund's pagan Lithuanian birth name is unknown. He was the son of the Grand Duke of Lithuania Kęstutis and his wife Birutė. 
After the death of Kęstutis, he was a prisoner of Jogaila from 1382–1384. Sigismund was baptized in Catholic rite in 1383. In 1384, he escaped captivity and joined his brother Vytautas the Great, who allied himself with the
Polish-Lithuanian assault he was captured and imprisoned.
When fighting erupted between Švitrigaila and Sigismund Kęstutaitis for Grand Duke title, Jonas Goštautas supported Sigismund Kęstutaitis, who appointed him as governor of Smolensk later on. He served as governor of Smolensk for around four years until 1440 assassination of Grand Duke Sigismund Kęstutaitis forced him to leave this position. Serving many Duchy rulers he managed to gain and hold tremendous wealth and thus he became one of the richest noblemen of Lithuania.
Death of Sigismund Kęstutaitis left empty the throne of the