"Muhammad Tughlaq always preferred foreign Muslims to Indians for appointment as officers. The rebellion of Ain-ul-mulk Multani (1339) during his reign was a symptom of the resentment felt by the India-born nobles against this policy of prejudice.... Foreign nobles looked down upon Indian Muslim nobles, and considered them as ‘lowborn’, although not all foreign Muslims were of high lineage."
January 1, 1970
https://en.wikiquote.org/wiki/Caste_system_among_South_Asian_Muslims