The Ottoman Empire conquered and expanded under its Sultan Selim I, who ruled from (1512 to1520). But his son Sultan Suleyman, he strove the Ottoman Empire to conquering many and most of its lands, Sultan Suleyman conquered great cities, and brought military machines, a lasting culture to the great Ottoman Empire. Most of the history of this empire lies on the achievements around this one ruler who was high minded and had lots of dignity and pride. Suleyman called was now called “The Magnificent” for his numerous achievements and was also named the “Law-Giver” for the laws he established as he conquered many cities. Suleyman ruled with self-respect and fairness according to the Ottoman political theory. In the Ottoman state, most of the power rested with the monarch. The Monarch's main idea was to establish justice, it meant shielding the poor and the helpless from shady officials and unfair taxation.The Sultan had a central bureaucracy, which was led by the Grand Vizier, to be able to govern the Empire. He also had the authority to capsize the verdicts of the courts if he thought that the decisions were unjust. This did not put the Sultan above law instead he was chosen as the keeper of a lawful government and fair government.The Sultan was given the title of “Caliph” as well, meaning the supreme leader of Islam. When Suleyman became grew of old age, his two sons plotted to remove him from power and achieve access to the crown. The crown in the empire did not pass from father to son or to the next oldest brother but, it was given to the most worthy successor. Because of this, there was always a struggle for the crown. Once a successor was crowned, the other contenders were killed to eliminate any future competition as well as to have full control and restore order. This devilish practice was later removed and replaced by making the eldest son the heir and he should be kept insulated in a lavish imprisonment.