The 1926 Lithuanian coup d'état (Lithuanian: 1926-ųjų perversmas) was a military coup d'état in Lithuania that resulted in the replacement of the democratically elected government with a conservative authoritarian government led by Antanas Smetona. The coup took place on 17 December 1926 and was largely organized by the military; Smetona's role remains the subject of debate. The coup brought the Lithuanian Nationalist Union, the most conservative party at the time, to power. Before 1926, it had been a fairly new and insignificant nationalistic party: in 1926, its membership numbered about 2,000 and it had won only three seats in the parliamentary elections. The Lithuanian Christian Democrats, the largest party in the Seimas at the time, collaborated with the military and provided constitut