十月詔書
After the events of Bloody Sunday in January 1905 sparked a revolution in Russia, Tsar Nicholas II was forced to make concessions. In April 1905 a decree guaranteed complete freedom of religion, and even allowed religious studies to be conducted in native languages. The most important decree, the October Manifesto, was announced on October 30 (October 17 O.S.), 1905. It guaranteed many political rights, including the right to form political parties and organize convocations. This decree formed the legal basis for the assembly in Vilnius. The October Manifesto also announced the intent to hold elections to the Russian Parliament (Duma), and the Lithuanian organizers used this as an official pretext for the Seimas: they claimed that the Lithuanians needed to prepare themselves for this election.