The military leader who rose to power during the Napoleonic Wars was Napoleon Bonaparte. Initially a skilled general in the French Revolutionary Army, Napoleon gained prominence through his victories in campaigns across Europe. He ultimately staged a coup d'état in 1799, overthrowing the government and establishing himself as First Consul. Later, he declared himself Emperor of the French in 1804. His aggressive expansionist policies led to the spread of revolutionary ideals, the establishment of client states across Europe, and significant military confrontations, profoundly influencing European politics and society.