What is "ilulu"

Ilulu or Elulu, according to the Sumerian king list, was the fourth of four rivals ( Igigi, Imi, Nanum, and Ilulu) vying to be king of the Akkadian Empire during a three-year period following the death of Shar-kali-sharri. He was succeeded by Dudu, the first king to hold power in Akkad for more than a few years since the death of Shar-Kali-Sharri, after a reign of less than a year.

While there is virtually no surviving evidence dating from this short timespan, thought to correspond with the first Gutian inroads into Akkadian territory, it has been suggested that this Ilulu is to be identified as the same as the Gutian king Elulmesh, also known from the kinglist.