The Sejm of the Republic of Poland (; ) is the lower house of the Polish parliament. It consists of 460 deputies (poslowie, literally "envoys", in Polish) elected by universal ballot and is presided over by a speaker called the "Marshal of the Sejm of the Republic of Poland" (Marszalek Sejmu Rzeczypospolitej Polskiej). In the Kingdom of Poland, "Sejm" referred to the entire three-chamber parliament of Poland, comprising the lower house (the Chamber of Envoys; ), the upper house (the Senate; Polish: Senat) and the King. It was thus a three-estate parliament. Since the Second Polish Republic (1918–1939), "Sejm" has referred only to the lower house of the parliament; the upper house is called the Senat Rzeczypospolitej Polskiej ("Senate of the Republic of Poland").