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It happened today – this day in history – August 21
1192: Minamoto Yoritomo becomes Seii Tai Shōgun and de facto ruler of Japan. 1264: Kublai Khan accepts the surrender of his younger brother Ariq Böke at Xanadu at the end of the Mongol civil war. 1541: Ottoman Turks under Suleiman the Mgnificent capture …