Partition Sejm
The Partition Sejm (Polish: Sejm Rozbiorowy) was a Sejm lasting from 1773 to 1775 in the Polish–Lithuanian Commonwealth, convened by its three neighbours (the Russian Empire, Prussia and Austria) in order to legalize their First Partition of Poland. During its first days in session, that Sejm was the site of Tadeusz Rejtan's famous gesture of protest against Partition.