Stanislovas Kęsgaila

The treaty was reinforced with engagement of Grand Duke of Lithuania Alexander Jagiellon and Helena, daughter of Ivan III.

[3] Grand Hetman of Lithuania Konstanty Ostrogski was captured and was replaced by Semyon Olshanski who had gained military experience during the Polish–Ottoman War (1485–1503).

Such appointment is difficult to explain, but possibly it was a result of diplomatic negotiations that ended in a military alliance with the Livonian Order.

[3] Kęsgaila brought the Grand Ducal Lithuanian Army to help the besieged Mstislavl and Smolensk, but in both cases the Russians retreated without a fight.

He fathered three sons Mykolas, Jonas, and Stanislovas Kęsgaila and at least one daughter Barbara who married Jan Janowicz Zabrzeziński.