The sejm (Lithuanian: Seimas, Ruthenian: Соймъ, Polish: Sejm) was an early parliament in the Grand Duchy of Lithuania. It was active from 1445 to 1569, when it was officially abolished by the Union of Lublin.[1] The Sejm was an irregular gathering of the Lithuanian nobility, called as needed by the Grand Duke or during an interregnum by the Lithuanian Council of Lords (an early government). The meetings would usually last one or two weeks. Sejm gradually evolved from a meeting of the most powerful magnates to a full legislative institution representing all of the nobility.[2] The Sejm was not the main political player as it was overshadowed by the Council of Lords. The Union of Lublin created a new state, the Polish–Lithuanian Commonwealth, and joined the Sejm of Lithuania with Sejm of Poland into one Sejm of the Polish–Lithuanian Commonwealth. However, the Sejm continued to convene under the name of Lithuanian Convocation. In total there were 40 Sejm and 37 Convocations.[1]