SejmSejm, before the twentieth century, was the name of the Polish parliament, which consisted of the lower house (Izba Poselska) and the upper house (Senat).
The history of the Sejm dates back to 1493.
Since 1918, the name Sejm has referred only to the lower house of the Parliament; the upper house is still the Senate - Senat. Since the fall of Communism, the Sejm comprises 460 members elected in proportional elections every 4 years.
see also Politics in Poland