Was there ever a Sultan that became a dictator?

Almost all sultans have been absolute monarchs, meaning that they wielded untouchable dictatorial power. All of the Ottoman Sultans, especially Mehmed II, Bayezid II, Selim I, and Suleiman I were dictators. The current Sultan Qaboos of Oman is another dictator. Now, calling these men dictators is only a statement that they had authoritarian power to determine laws and strictures. It makes no value judgment as to whether they were good rulers or bad rulers.