Prince Janusz Radziwiłł of Trąby (also known as Janusz the Second or Janusz the Younger, 1612–1655) was a notable Polish–Lithuanian noble and magnate. Throughout his life he 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 was also a voivode of Vilna Voivodeship, as well as a starost of Samogitia, Kamieniec, Kazimierz and Sejwy.
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Prince Janusz Radziwiłł of Trąby (also known as Janusz the Second or Janusz the Younger, 1612–1655) was a notable Polish–Lithuanian noble and magnate. Throughout his life he 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 was also a voivode of Vilna Voivodeship, as well as a starost of Samogitia, Kamieniec, Kazimierz and Sejwy.
In his times he was one of the most powerful people in the Commonwealth, often described as a de facto ruler of the entire Grand Duchy of Lithuania. During the "Deluge", the Swedish invasion of Poland-Lithuania during the Second Northern War, he sided with the Swedish king signing the Treaty of Kėdainiai and the Union of Kėdainiai. This move however antagonised him with most of other nobles, including members of his own family. His forces were eventually defeated in battle and he himself died in a besieged castle at Tykocin.
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