Olyka (, , Olik) is an urban-type settlement in Lutsk Raion, Volyn Oblast, Ukraine. It is located east of Lutsk on the Putylivka Rriver. Its population is . History The village of Olyka was founded in the early Middle Ages as one of the villages belonging to the Kievan Rus'. It was first mentioned in 1149 in the Hypatian Chronicle. In the 14th century it was conquered by Grand Duchy of Lithuania. Under the Grand Duchy of Lithuania, the village grew rapidly and became a centre of local magnates, initially the family of Kiška and, after 1533, the Radziwills. In 1548 Mikolaj Radziwill the Black became Duke of Olyka. In 1569, Olyka became part of Poland after the Union of Lublin. In the second half of the 16th century, during the Protestant Reformation, the town became one of the most important centres of Calvinism in the Polish–Lithuanian Commonwealth. Its growth was halted by the Chmielnicki Uprising of 1648, during which the town was captured by Cossacks, plundered and burnt. However, it was soon rebuilt and in 1654 it received city rights. As the main seat of one of the branches of the influential Radziwill family, Olyka became one of the most important political and trade centres of all of Volhynia. In the Third Partition of Poland (1795), the town was annexed by the Russian Empire and became part of the Volhynian Governorate. In the 19th century, it continued to play a role as a centre of wood and grain trade. During World War I in 1915 and 1916, the area was a scene of heavy fighting between the forces of Russia and Austria-Hungary. After the Polish-Bolshevik War, the town was restored to Poland as part of Wołyń Voivodeship, and the local palace was refurbished. Following the Polish Defensive War of 1939 and the Nazi-Soviet Alliance, the town was occupied by Soviet Union forces. After Operation Barbarossa, when Germany attacked the Soviet Union, the German occupation started and lasted until 1944. Olyka was attacked and deeply damaged by Organization of Ukrainian Nationalists (OUN) forces. After World War II the area was annexed by the Soviet Union and incorporated into the Ukrainian SSR. Since 1991 it is a part of independent Ukraine. Notable landmarks Olyka Castle (surrounded by Radziwill Fortress) – late 16th century, expanded in the mid-18th century, damaged after 1945, restored after 1990 The Calvinist Church, converted in 1580 to