September 1520 is when Suleiman the Magnificent (b.1494) took over as Emperor of the Ottoman Empire. Not only was he pretty magnificent, but so was his empire, which ranged all over the place.
He is remembered for a number of good qualities and constructive projects on behalf of the folks he ruled over. His was referred to as the Golden Age.
Now you know. YIR is on the job, giving credit where it is due.