Gustav III was known in Sweden and abroad by his Royal Titles, or styles:
Gustav, by the Grace of God, of the Swedes, the Goths and the Vends King, Grand Prince of Finland, Duke of Pomerania, Prince of

 ...

Gustav was born in Stockholm. He was placed under the tutelage of Hedvig Elisabet Strömfelt until the age of five, then educated under the care

 ...

Gustav married Princess Sophia Magdalena, daughter of King Frederick V of Denmark, by proxy in Christiansborg Palace, Copenhagen, on 1 October 1766 and in person in Stockholm on 4 November 1766. Gustav was first impressed by Sophia

 ...

At the time of his accession, the Swedish Riksdag held more power than the monarchy, but the Riksdag was bitterly divided between rival parties, the Hats and Caps. On his return to Sweden, Gustav III tried unsuccessfully to mediate between the bitterly divided parties.

 ...

Gustav worked towards reform in the same direction as other contemporary sovereigns of the Age of Enlightenment. Criminal justice became

 ...

The Riksdag of 1786 marks a turning-point in Gustav's history. Henceforth he showed a growing determination to rule without a parliament, a cautious and gradual passage from semi-constitutionalism to semi-absolutism.
At the same time, his

 ...

Gustav first intervened actively in politics during the December Crisis (1768), when he compelled the dominant Cap faction, which mainly represented the interests of the peasantry and clergy,

 ...