The Ottoman Empire was one of the mightiest and longest-lasting dynasties in world history. This Islamic-run superpower ruled large areas of the Middle East, Eastern Europe and North Africa for more than 600 years. The chief leader, known as the Sultan, was given absolute religious and political authority over his people. While Western Europeans generally viewed them as a threat, many historians regard the Ottoman Empire as a source of great regional stability and security, as well as important achievements in the arts, science, religion and culture.