Who was King Louis 16?

Louis XVI was king of France from 1775 to 1792. His power as king was gradually weakened after the French Revolution began in 1789. Three years later the monarchy was abolished, and Louis was imprisoned and executed for treason in January 1793.
It was ironic that Louis XVI was the king during whose reign the Revolution occurred, since his tenure by the standards of absolute monarchy was mild and relatively liberal. He supported the Americans during the War of Independence and sent armies, the navy, armaments and supplies, and huge amounts of cash to America to aid the cause of Independence and defeat France's perpetual enemy, Great Britain. The money spent by France drove the country massively into debt and was one of the factors that brought on the Revolution in 1789.
At first Louis and his queen, Marie-Antoinette, daughter of Maria Theresa of Austria and brother of the current Holy Roman Emperor Joseph II, appeared to cooperate with the revolutionary movement and agreed that reform of the system was necessary. Though Louis was well meaning, both he and his consort were clueless as to what the people really wanted or needed. When they tried in June of 1791 to escape across the border into Germany, they were arrested and brought back to Paris. From this point on, in spite of Louis' acceptance of the Constitution in September of that year, the royal couple were viewed as traitors and enemies. The situation became worse for them when Austria and Prussia declared war on Revolutionary France in 1792. The monarchy was abolished in September of that year, and Louis XVI was executed by beheading in early 1793, with Marie-Antoinette killed later in the same year.