"An inscription lying in the ruins of the fort area of Harihar town, Davanagere, has been dated to July 1, 1387 CE – during the reign of Harihara Raya II, the third king of the Vijayanagara Empire. The inscription calls Harihara II the ‘Hindu Raya Suratrana,’ (the protector of Hindu rulers). This is one of the earliest references to kings ascribed to as ‘Hindu,’ predating the arrival of Mughals by a century-and-a-half and Shivaji Maharaj by three centuries."
January 1, 1970
https://en.wikiquote.org/wiki/Hindu