The Great Northern War was a war with Russia, Denmark-Norway, and Saxony-Poland against Sweden which lasted from Febuary 22, 1700 until September 10, 1721. Sweden was making advances in the Baltic Sea, which angered the nearby nations, causing a war. Eventually, Poland surrended and ended its allience with Russia. Later, Charles XI, the king of Sweden was killed in battle, and the Sweden influence declined. This made Russia a major power in that area.