During the early Elamite period, the rulers were known as the kings of Awan, but later on, they are referred to as the kings of Anzan, Susa, and Elam. There is also evidence that suggests Awan may have been a political district that was a part of a larger Anshan. Particularly since it has been discovered that Anshan was politically and culturally advanced. From the 15th century BC, Elamite rulers at Susa began using the title "King of Anshan and Susa" (in Akkadian texts, the toponyms are reversed, as "King of Susa and Anshan"), and it seems probable that Anshan and Susa were in fact unified for much of the "Middle Elamite period". The last king to claim this title was Shutruk-Nahhunte II (ca. 717-699 BC).