Most Ottoman historians agree that Mehmed II was the true founder of the Ottoman Empire, not only for his military conquests, but for his work on the internal structure of the empire as well. The Ottoman Empire was an absolute monarchy, with the sultan assuming all powers over the realm. In the first centuries of the Ottoman Empire, the sultans believed that corruption weakened their power in the eyes of the people; therefore the Ottoman Empire was intolerant toward corruption. The Ottoman Empire was by far the most powerful empire in the Islamic world in the 15th century. The Safavid Empire (Eastern Ottoman) was a short-lived one, particularly when compared to the long-lived Ottoman Empire. It established itself as one of Islam's greatest dynasties by its widespread conversion of the Persian people to Shiteism, and thus for the development of the Persian nationalism that remains strong today in Iran. Jews in the Ottoman Empire had a status of dhimmi, in subjugation to Muslims. However, early on they allowed the Jews to freely practice their religion.