Si'um
Si'um, also Siium, or Sium (, "si-u-um", "fl." late 3rd millennium BCE) was the 18th Gutian ruler of the Gutian Dynasty of Sumer mentioned on the ""Sumerian King List"" ("SKL"). According to the "SKL": Si'um was the successor of Yarlaganda. Sium was the last king of the Gutians before Tirigan (likewise according to the "SKL"). A tablet is known, dated to c. 2130 BCE, mentioning the allegiance of Lugalanatum prince of Umma to Sium, King of the Gutians.