Q. Which ruler got finally defeated in the "Battle of Waterloo"?
Answer: Napoleon Bonaparte
Notes: Battle of Waterloo was fought on 18 June 1815, near Waterloo in Belgium, part of the United Kingdom of the Netherlands at the time. A French army under the command of Napoleon Bonaparte was defeated by two of the armies of the Seventh Coalition: A British-led coalition consisting of units from the United Kingdom, the Netherlands, Hanover, Brunswick, and Nassau, under the command of the Duke of Wellington; and a Prussian army under the command of Field Marshal von Blucher. This battle marked the final defeat of Napoleon and the end of the Napoleonic Wars. The defeat at Waterloo ended Napoleon’s rule as Emperor of France and ended his First French Empire.