1682–1718, king of Sweden (1697–1718), son and successor of Charles XI. The regency under which he succeeded was abolished in 1697 at the request of the Riksdag. At the coronation he omitted the usual oath and crowned himself. Charles's youth and inexperience invited the coalition (1699) of Peter I of Russia, Augustus II of Poland and Saxony, and Frederick IV of Denmark that challenged Swedish supremacy in the Baltics. The resulting Northern War quickly revealed Charles's abilities. In one of the most brilliant campaigns in history, Charles forced Denmark to make peace (Aug., 1700), defeated Peter I at Narva (Nov., 1700), subjugated Courland (1701), invaded Poland and, declaring Augustus II dethroned, secured the election (1704) of Stanislaus I as king of Poland. In 1706 he invaded Saxony and forced Augustus to recognize Stanislaus as king, end his alliance with Russia, and surrender his adviser, Johann Reinhold von Patkul, whom Charles then had broken on the wheel. Charles then concentrated on his chief enemy, Peter I. He secured the alliance of the Cossack leader Mazepa and invaded Russia in 1708. The Swedish army was outnumbered, weakened by long marches and a cold winter, and without the active leadership of Charles, who was wounded; it suffered a disastrous defeat by the Russians at Poltava. Much of the army was captured, and Charles fled to Turkey, where he persuaded Sultan Ahmed III to declare war (1710) on Russia. After the Peace of the Pruth (1711) between Russia and Turkey, Charles, who had taken residence near Bender in Bessarabia, became an increasingly unwelcome guest. He was requested to leave Turkey but obstinately refused. A whole Turkish army was sent (1713) to dislodge him from his house; Charles defended it with a handful of men for several hours until he was forced by fire to make a sortie. Taken prisoner and detained near Adrianople, he feigned sickness for over a year. Late in 1714 he unexpectedly arrived at Swedish-occupied Stralsund and defended it against the Prussians and the Danes until Dec., 1715. When it fell he escaped to Sweden and proceeded to invade (1716) Norway. He was killed in the Swedish trenches while besieging the fortress of Fredrikssten. He was succeeded by his sister, Ulrica Leonora, who was forced to recognize a new constitution that gave most of the power to the nobles and clergy. During her reign the Northern War ended (1721) with substantial Swedish losses. His final failure cost Sweden its rank as a great power. The classic biography is Voltaire's History of Charles XII.

See also biographies by R. N. Bain (1895, repr. 1969), J. A. Gade (1916), F. G. Bengtsson (tr. 1960), and R. M. Hatton (1968).

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