Britannica (Gustav II Adolf (Gustavus II Adolphus))
Encyc. Americana, c1999 (Gustav II, better known as Gustavus Adolphus)
German Wikipedia, Jun. 28, 2013 "Gustav II. Adolf (Schweden)" (Gustav II. Adolf; born Dec. 9 (jul.), Dec. 19 (greg.), 1594 in Stockholm; died in battle, Nov. 6 (jul.), November 16 (greg.), 1632, Lützen, Germany)
Gustaw II Adolf, 1996.
Wikipedia, Jun. 28, 2013 "Gustavus Adolphus of Sweden" (Gustav II Adolf; widely known in English by his Latinized name Gustavus Adolphus, or as Gustavus Adolphus the Great (Swedish: Gustav Adolf den store, Latin: Gustavus Adolphus Magnus; a formal posthumous distinction passed by the Riksdag, 1634); also known by the epithets "the Golden King" and "the Lion of the North"; born Dec. 9, 1594 (O.S.) in Stockholm, died Nov. 6, 1632 (O.S.), Lützen, Germany; oldest son of Duke Charles of the Vasa dynasty and his 2nd wife, Christina of Holstein-Gottorp; Duke Charles compelled the abdication of the Catholic king of Sweden, Sigismund III, in 1599, and reigned as regent until taking the throne as Charles IX in 1604; Gustavus Adolphus succeeded to the throne in October 1611 and to reign on his own in December; one illegitimate son, Gustav, by Margareta Slots; by his wife Maria Eleonora of Brandenburg, 4 children, of whom only Christina, the youngest daughter, later Queen of Sweden, survived; after several wars in the Baltic region, Gustavus Adolphus lands 1630 in Germany to enter into the Thirty Years' War; after several victories and one defeat against imperial Catholic forces, Gustav Adolphus is killed at the Battle of Lützen, though his army defeats the imperialists and the Swedish war effort continues until the Peace of Westphalia 1648)