Massalski commissioned the reconstruction of the Vilnius Cathedral by Laurynas Gucevičius, which brought it to its present appearance.[6] He became the owner of the Verkiai Palace in 1780 and organized its major reconstruction in the Neoclassical style, also by Gucevičius.
Accused of treason, he was hanged in Warsaw on 28 June 1794 by an angry mob in the aftermath of the Warsaw Uprising.
References
^Hierarchia Catholica medii et recentioris aevi, v. VI, Patavii 1958, p. 442 (in Latin)