Gyges of Lydia

Gyges (reigned c. 680–644 BC) was the founder of the Mermnad dynasty of Lydian kings and the first known king of the Lydian kingdom to have attempted to transform it into a powerful empire. Gyges reigned 38 years according to Herodotus.

Source: Wikipedia — https://en.wikipedia.org/wiki/Gyges_of_Lydia