who was Ziauddin Barani?

Ziauddin Barani (1285–1357) was a Muslim historian and political thinker who lived in Delhi Sultanate (present day North India) during Muhammad bin Tughlaq and Firoz Shah's reign. He was best known for composing the Tarikh-i-Firuz Shahi, a major historical work on medieval India, which covers the period from the reign of Ghiyas ud din Balban to the first six years of reign of Firoz Shah Tughluq and the Fatwa-i-Jahandari which details the Muslim Class System in South Asia.