Sejm required four years to propagate and adopt. The constitution's acceptance, and the possible long-term consequences it may have had, is arguably the reason for which the powers of Habsburg Austria, Russia and Prussia then decided to partition the Polish–Lithuanian Commonwealth, thus putting an end to over 300 years of Polish parliamentary continuity. It is estimated that between 1493 and 1793, a Sejm was held 240 times, the total debate-time sum of which was 44 years. Partitions After the fall of the Duchy of Warsaw, which existed as a Napoleonic client state between 1807 and 1815, and its short-lived Sejm of the Duchy of Warsaw, the Sejm of Congress Poland was established in Congress Poland of the Russian Empire; it was composed of the king (the Russian emperor), the upper house (Senate), and the lower house (Chamber of Deputies). Overall, during the period from 1795 until the re-establishment of Poland's sovereignty in 1918, little power was actually held by any Polish legislative body and the occupying powers of Russia, Prussia (later united Germany) and Austria propagated legislation for their own respective formerly-Polish territories at a national level. Congress Poland The Chamber of Deputies, despite its name, consisted not only of 77 envoys (sent by local assemblies) from the hereditary nobility, but also of 51 deputies, elected by the non-noble population. All deputies were covered by Parliamentary immunity, with each individual serving for a term of office of six years, with third of the deputies being elected every two years. Candidates for deputy had to be able to read and write, and have a certain amount of wealth. The legal voting age was 21, except for those citizens serving in the military, the personnel of which were not allowed to vote. Parliamentary sessions were initially convened every two years, and lasted for (at least) 30 days. However, after many clashes between liberal deputies and conservative government officials, sessions were later called only four times (1818, 1820, 1826, and 1830, with the last two sessions being secret). The Sejm had the right to call for votes on civil and administrative legal issues, and, with permission from the king, it could also vote on matters related to the fiscal policy and the military. It had the right to exercise control over government officials, and to file petitions. The 64-member Senate on the other hand, was composed of voivodes and kasztelans (both types of