Gustavus III was the king of Sweden during the late 18th century. He is known for his political reforms and his role in the French Revolution. There are a number of synonyms for the name Gustavus III, such as Gustaf III, Gustav III, Gustave III, and Gustavo III. Additionally, some of the titles he was given during his lifetime can also be considered synonyms, such as His Majesty, King of Sweden, and Grand Duke of Finland. Though his reign was relatively short, Gustavus III is remembered as a progressive and influential monarch who left a lasting impact on his country and the world.