The 13th century was the century which lasted from January 1, 1201 to December 31, 1300 in the Gregorian calendar.

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When were the first mosques established in Constantinople?

In his book The Man of Numbers about Leonardo Pisano (Fibonacci), Keith Devlin quotes a problem from the Liber Abbaci (Devlin's spelling, I know most others spell it Liber Abici) which is titled "A ...