[7] Tradition gives that he was assassinated, as recorded in the Bārûtu, a compendium of extispicy dared to the first millennium BC: "If the heart is like a testicle—an omen of king Rimuš, whom his courtiers killed with their cylinder seals".

A number of his votive offerings have been found in excavated temples in several Mesopotamian cities including Ur, Sippar, Khafajah, and Brak.

[18][19] "[Rimus, king of the world:] [from ancient times n]o one had fashioned a statue (made) of meteoric iron for the god Enlil.

This empire stretched in the west to Syria in places like Tell Brak and Tell Leilan, to the east in Elam and associated polities in that region, to southern Anatolia in the north, and to the "lower sea" in the south encompassing all the traditional Sumerian powers like Uruk, Ur, and Lagash.

All of these political entities had long histories as independent powers and would periodically re-assert their interests throughout the lifetime of the Akkadian Empire.

[23] According to his inscriptions, he faced widespread revolts, and had to reconquer the cities of Ur, Umma, Adab, Lagash, Der, KI.ANki, and Kazallu from rebellious ensis (KI.ANki is thought to be at the site of Tell Shmet):[24][25][26] "Rimuš, king of the world, in battle over Adab and Zabalam was victorious, and 15,718 men he struck down, and 14,576 captives he took.

[29] There are also records of victorious campaigns against Elam and Marhashi (Sumerian name for the Akkadian "Parahshum") in a longer (CBS 13972 and Ni 3200) and shorter (AO 5476) version.

[31][32] According to the account, troops from (Meluhha) also participated in the conflict:[24] After the victorious campaigns of Rimush, under his successor Manishtushu, Elam would be ruled by Akkadian Military Governors, starting with Eshpum, and Pashime, on the Iranian coast, was ruled by an Akkadian Governor named Ilshu-rabi.

Zahar, Elam, [G]upin, and [Me]luhha assembled in Pa[rah]sum for battle, but he, (Rimus) captured S[idga'u], general of [Parahsum] (and) [the king(?)

As for the o[ne who] re[moves this inscription, may the gods Enlil and Sam]as [te]ar out [his] foundation] an [dest]roy [his progeny].

The inscription is much damaged and the only readable portion of AO 2679 not pertaining to land distribution reads "after Akkade received the kingship".

[39][40] The stele has been attributed to Rimush on stylistic and epigraphical grounds but this is also in dispute with a counter proposal dating it to the time of Naram-Sin.

[38] The prisoners depicted in the relief are visibly Mesopotamian, and their slaughtering at the hand of Akkadian soldiers is consistent with the known accounts of Rimush.