After Stanislovas' early death, the office of the Elder of Samogitia was assigned to Piotr Kiszka, who was not a member of the Kęsgaila family, which had the position of Elders of Samogitia for more than a century. Stanislovas' last will left about a third of his possessions to the Grand Duke, who then transferred the towns to his wife, the Grand Duchess Bona Sforza.
Following Stanislovas' death, the Elder of Samogitia position was given to Piotr Kiszka, who was not from the Kęsgaila family, which had held this role for over a century. Stanislovas' final will bequeathed about one-third of his possessions to the Grand Duke, who then transferred the towns to his wife, the Grand Duchess Bona Sforza.