what methods did Ottoman Sultans (rulers) use to legitimize and consolidate power in the Ottoman Empire?

The Ottoman empire was one of the more successful empires in its time until its decline in the 19th century. It was ruled by Sultans who used various methods to legitimize and consolidate their power such as;

Centralising power in the hands of the Sultan's family such that for 7 centuries, the Ottoman empire was ruled by one family. Spreading doctrine through the education system which was run by the state. The use and maintenance of a strong slave army that were well equipped. Controlling the JudiciaryEncouraging conversion to Islam which united the empire. Discouraging discontent and rebellious thoughts by ruthless actions against rebellious or disobedient local leaders. Assimilating ideas from other cultures to bolster their own and thus make it better.

So what is the question