lived and died in the palace.

Sigismund I the Old, after his ascension to the Grand Duchy of Lithuania, conducted his affairs in the Royal Palace as well as in Vilnius Cathedral. During the rule of Sigismund I the palace was greatly expanded, to meet new needs of the Grand Duke - another wing was added, as well as a third floor; the gardens were also extended. By contemporary accounts the palace was worth 100,000 ducats. The palace reconstruction plan was probably