Janusz Radziwiłł, the most powerful magnate of Lithuania, is credited with being responsible for the first instance of the liberum veto act, which was used to break the deliberations of the sejm of 1652.
Janusz Radziwiłł, kõige võimsam Leedu magnaat, loetakse vastutavaks esimese liberum veto juhtumi eest, mida kasutati 1652. aasta seimi arutelude katkestamiseks.