Biržai (, known also by several alternative names) is a town in northern Lithuania. Biržai is famous for its reconstructed Biržai Castle manor, and the whole region is renowned for its many traditional-recipe beer breweries. Names The name of the town is of Lithuanian origin and is spelled in different forms in other languages: Birsen (German), Birże (Polish), Birzhai (Биржай, Russian - pre-1917 Биржи), and בירז/Birz or Birzh (Yiddish) and simplified to Birzai in English. History The town's first written mention dates to 1455. The construction of Biržai Castle began in 1586, and the town was granted Magdeburg Rights in 1589. In 1575, as preparation for the castle's construction, a dam was built on the Agluona and Apaščia Rivers at their confluence, and the artificial Lake Širvėna, covering about , was created. It is the oldest surviving artificial lake in Lithuania. The town's history is closely associated with the Radziwiłł family (Lithuanian: Radvila). Jerzy Radziwiłł was the first noble to settle in the town. Later, after his daughter, Barbara Radziwiłł married the Grand Duke of Lithuania and King of Poland Sigismund II Augustus in 1547, the power and influence of the family grew immensely. The Radvila family established a Protestant church and school, and the town became a cultural center of the Protestant Reformation in Lithuania. The local community of Lithuanian Jews, which settled in the Duchy of Biržai at the end of the 16th century, was influential, establishing an interest-free loan society, two major flour mills, and an international linen export business. The Islamic Lipka Tatars performed military, police, and postal duties for the Radziwill family. During the Wars with Sweden, Biržai Castle was an important point of defence. In 1625, Gustavus Adolphus, king of Sweden, attacked the castle with 8,000 soldiers and it was forced to surrender. The castle was left in ruins and was rebuilt, only to be burnt in 1655. In 1662–1669, it was rebuilt again in Renaissance style. On 9 March 1701, August II the Strong and Peter I of Russia (Peter the Great) signed a pact in the castle to unite their forces against Sweden. However, in 1704 the castle was completely destroyed and was left in ruins until its restoration in the 1990s. The town's population suffered greatly due to wars and religious conflicts between the Protestants and Catholics. In the late 18th century, Biržai lost its town rights. The Radziwiłłs lost their