Prince Janusz Radziwiłł of Trąby (also known…

Prince Janusz Radziwiłł of Trąby (also known as Janusz the Second or Janusz the Younger, a notable Polish–Lithuanian noble and magnate, has throughout his life occupied a number of posts in the state administration, including that of Court Chamberlain of Lithuania (from 1633) and Field Hetman of Lithuania (from 1654).

He is also a voivode of Vilna Voivodeship, as well as a starost of Samogitia, Kamieniec, Kazimierz and Sejwy.

Often described as a de facto ruler of the entire Grand Duchy of Lithuania, his palace has been under construction from 1635 until 1653 in the Old Town of Vilnius.

It is likely that the wooden mansion of his ancestor, Mikołaj "the Black" Radziwill’, was on the same site as the current building.

Constructed according to the design by Jan Ullrich.

It has features of the Netherlands Renaissance as well as Manneristic decorations native to the Lithuanian Renaissance architecture.

Its original layout and symmetry of structural elements is distinctive to the palaces of the Late French Renaissance, resembling that of Château de Fontainebleau and Luxembourg Palace in Paris.