During the reign of Louis XVI France suffered from constant economic troubles. He wanted France to lose its war against Austria and have his power restored. Execution Of Louis Xvi History Crunch History Articles Biographies Infographics Resources And More On January 21 1793 King Louis XVI was guillotined after being tried for treason and being proven guilty. . An old problem the National Assembly. Why was King Louis XVI tried for treason. During the reign of Louis XVI France suffered from constant economic troubles. This was seen as treason and this is what he was tried for. On January 21 1793 King Louis XVI was guillotined after being tried for treason and being proven guilty. He wanted France to lose its war against Austria and have his power restored. Why was King Louis XVI tried for treason. King Louis XVI decided to commit treason because he never fully agreed with the French Revolution and the many c