Currently, Prussia is the leading state of the German Empire, being a constitutional monarchy. It is composed of 15 states. Its capital city is Königsberg, since Berlin, the largest city, is the capital of the German Empire. The head of government is usually the German emperor, while the Chief of state (Prime Minister) is the head of the house of Skomantas, which ruled Prussia until 1618.The Kingdom was established in 1240 after the Prussian victory against the Teutonic Order and the unification of the Prussian clans into one kingdom. In 1385, the Kingdom entered in a personal union with the Kingdom of Poland, and annexing Lithuania in 1429, and great part of the Terra Mariana, a Livonian Order possession in Livonia, in 1561, before seceding in 1596, and merging with various states in 1618 to form the state known as Brandenburg-Prussia. In 1701, It was elevated to kingdom, and, in the 19th century, had become the leading state of the German Empire. The kingdom of Prussia was abolished after the German defeat in the World War I, and re-established again in 1944. From 1945 to 1990, Prussia was a independent state, until the reformation of the German Empire in 1990, eventually recovering the territorial losses that had been suffered since 1919.