20th-century BC monarchs

Shilhaha (Elamite si-il-ha-ha, or shi-il-ha-ha, mshi-il-ha-ha, cf. middle-Elamite shilha ‘strong’ ; ) was an Elamite ruler of the 20th century BC (Middle Chronology). He was first to be attested as sukkalmah in Elam, effectively founding the Sukkalmah Dynasty. At least 11 rulers of this dynasty used the phrase “descendant of Šilhaha” (ruhušak) in their titles as evidence of their legitimacy. Inscriptions on a bronze “gunagi” vessel and on Atta-Hušu cylindroid show that he was contemporary of Ebarat II, one of the last kings of Shimashki.

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Iddi[n]-Sin (: Iddî-Sîn; ) was a King (𒈗 Šàr, pronounced Shar) of the Kingdom of Simurrum. Simurrum was an important city state of the Mesopotamian area, during the period of Akkad down to Ur III. Simurrum disappears from records after the Old Babylonian period. According to an inscription (the stela from Qarachatan Village, Sulaymaniyah Governorate, Iraqi Kurdistan, now located in the Sulaymaniyah Museum), Iddi[n]-Sin seems to have been contemporary with the Lullubi king Annubanini.

Ibbit-Lim () was the earliest known ruler of the Third kingdom of Ebla, in modern Syria.

Ikūn-pî-Ištar, meaning “Ištar's word has come true” and inscribed [i-k]u-un-pi4-eš4-tár, () was a Mesopotamian king of uncertain jurisdiction. Thorkild Jacobsen suggested Uruk, presumably preceding Sîn-kāšid, contemporary with the latter part of the 1st Dynasty of Isin.