1750 BC-Anitta Text

Anitta, son of Pithana, was a king of Kussara, a city that has yet to be identified. He is the earliest known ruler to compose a text in the Hittite language.

His high official, or rabi simmiltim, was named Peruwa.^[2]

https://lrc.la.utexas.edu/eieol/hitol/10

https://en.wikipedia.org/wiki/Anitta