Ain-e-Akbari

The Ain-i-Akbari (Persian: آئینِ اکبری‎‎) or the "Constitution of Akbar", is a 16th-century, detailed document recording the administration of emperor Akbar's empire, written by his vizier, Abu'l-Fazl ibn Mubarak. It makes the Volume III and the final part of the much larger document, the Akbarnama (Persian: اکبر نامه‎‎), the Book of Akbar, also by Abul Fazl, and it itself is in three volumes.

It is currently housed in the Hazarduari Palace, in West Bengal.

The Ain-i-Akbari is the third volume of the Akbarnama containing information regarding Akbar's reign in the form of, what would be called in modern times, administration reports, statistical compilations, or gazetteers. It contains the áín (i.e., mode of governing) of Emperor Akbar, and is, in fact, the administration report and statistical Return of his government. The first volume of the Akbarnama contains the history of Timur's family and the reigns of Babar, the Súr kings, and Humayun. The second volume is devoted to the detailed history of the nearly forty-six years of the Akbar's reign. Since it was written around 1590, it also contains details of Hindu beliefs and practices as well as a history of India.

...
Wikipedia