Ibn Khaldun, Tunisian historian and theologian (died 1406)

Ibn Khaldun was an Arab Islamic scholar, historian, philosopher and sociologist. He is widely acknowledged to be one of the greatest social scientists of the Middle Ages, and considered by a number of scholars to be a major forerunner of historiography, sociology, economics, and demography studies.

May 27 is the 147th day of the year in the Gregorian calendar; 218 days remain until the end of the year.