"However, contemporary writings of Persian chroniclers nowhere mention caste as a factor leading to conversions. Muslim historians of medieval India were surely aware of the existence of the caste system in Hindu society; Alberuni, Abul Fazl and emperor Jahangir, to mention a few. And yet no one mentions even once tyranny on the low caste people as cause for conversion. Their evidence shows beyond doubt that conversions in India were brought about by the same methods and processes as seen in Arabia, Persia, Central Asia, etc. India was not the first country where Islam was introduced in medieval times. It had spread in Persia, Central Asia, Afghanistan, and North Africa before it came to India. There was no caste system in these countries and yet there were large-scale conversions there."