The French Revolution saw the overthrow and execution of the previously reigning French Monarch. Both King Louis XVI and his wife Marie Antoinette would be brutally executed by guillotine in 1793. For the next twenty years, Europe would enter a series of large-scale military conflicts. These wars, often called the Coalition Wars, involved, at some point or another, almost all European nations and had a worldwide impact. They only ended when Napoleon Bonaparte was defeated at Waterloo in 1815. Provided here is a link with more information on the Coalition Wars and their effect.