Gustav III (24 January [ O.S. 13 January] 1746 – 29 March 1792), note on dates  also called Gustavus III,  was King of Sweden from 1771 until his assassination in 1792. He was the eldest son of Adolf Frederick of Sweden  and Queen Louisa Ulrika of Prussia . Gustav was a vocal opponent of what he saw as the abuse of political privileges seized by the nobility since the death of King Charles XII.
Gustav III, (born Jan. 24, 1746, Stockholm, Swed.—died March 29, 1792, Stockholm), king of Sweden (1771–92), who reasserted the royal power over the Riksdag (parliament). Gustav, the eldest son of King Adolf Fredrik, was an intelligent and cultured advocate of the Enlightenment. In 1766 he married Sofia Magdalena, daughter of King Frederick V of Denmark.
While visiting Paris, Gustav III (ruled 1771–92) acceded to the throne. Before returning, he concluded another treaty with France. In 1772 he used the royal guard and officers of the Finnish army to seize control of the government from the parliament in a bloodless coup d’état.
Dec 12, 2003 · Gustav III of Sweden (1746-92) is one of the least studied of the later eighteenth-century rulers known as the Enlightened Despots. He was not a great general like Frederick II of Prussia or a great empire-builder like Catherine II of Russia, nor did he labour tirelessly to rationalise the administration of a conglomeration of disparate principalities like Joseph II of Austria.
Gustav III, född 13 januari 24 januari 1746 i Kungshuset på Riddarholmen i Stockholm, död 29 mars 1792 på Stockholms slott, var kung av Sverige från 1771 fram till sin död. Han var son till Adolf Fredrik och Lovisa Ulrika, bror till Karl XIII, far till Gustav IV Adolf, och kusin till Katarina II av Ryssland. På grund av sitt stora kulturintresse kallas han ibland "Teaterkungen".
Gustav III, the eldest son of King Adolf Frederick of Sweden, was the king of Sweden from 1771 to 1792. He seized control of the kingdom through a coup in 1772, and his 1789 ‘Union and Security Act’ took away the rest of the powers of the Swedish parliament. He invested in the economic and cultural prosperity of Sweden.
Gustav III. Biography: Gustav III reigned as the King of Sweden from 1771 until his assassination in 1792. During this time he became one of the key proponents of a policy known as "enlightened absolutism", where he espoused the ideals of the Enlightenment while increasing his own power and autocracy. To this end he became a patron of the Swedish arts, curtailed the power and corruption of the nobility and introduced reforms to liberalize the economy.