Erishum I in the context of "Kanesh"

The Old Assyrian period was the second stage of Assyrian history, covering the history of the city of Assur from its rise as an independent city-state under Puzur-Ashur I c. 2025 BC to the foundation of a larger Assyrian territorial state after the accession of Ashur-uballit I c. 1363 BC, which marks the beginning of the succeeding Middle Assyrian period. The Old Assyrian period is marked by the earliest known evidence of the development of a distinct Assyrian culture, separate from that of southern Mesopotamia and was a geopolitically turbulent time when Assur several times fell under the control or suzerainty of foreign kingdoms and empires. The period is also marked with the emergence of a distinct Assyrian dialect of the Akkadian language, a native Assyrian calendar and Assur for a time becoming a prominent site for international trade.

For most of the Old Assyrian period, Assur was a minor city-state with little political and military influence. In contrast to Assyrian kings of later periods, the kings in the Old Assyrian period were just one of the prominent leading officials in the city's administration and normally used the style Išši'ak Aššur, which translates to "governor (on behalf) of (the god) Ashur", rather than šar (king). The kings presided over the city's actual administrative body, the Ālum (city assembly), which was made up of prominent and influential members among Assur's populace. Though lacking in military and political might, Assur was an important economic center in northern Mesopotamia. From the time of Erishum I (c. 1974–1935 BC) until the late 19th century BC, the city was a hub in a large trading network that spanned from the Zagros Mountains in the east to central Anatolia in the west. During their time as prominent traders the Assyrians founded a number of trading colonies at various sites in the trading network, such as Kültepe.

Shalim-ahum or Šalim-ahum (died c. 1991 BC) was a ruler of Assyria in the late 21st century to early 20th century BC. The Assyrian King List records his name as Šallim-aḫḫe, inscribed šal-lim-PAB, meaning, “keep the brothers safe”, and he appears among the six kings “whose eponyms are not found”, meaning that the length of his reign was unknown. He was described as the son of Puzur-Ashur I (dumu Puzu Assur) in his only known inscription. He is the earliest independent ruler to be attested in a contemporary inscription. Carved in curious archaic character mirror-writing in Old Assyrian on an alabaster block found during the German excavations at Assur under Walter Andrae, this sole exemplar of his contemporary inscriptions records that the god Ashur “requested of him” the construction of a temple and that he had “beer vats and storage area” built in the “temple area”.

He ruled during a period when nascent Assyrian merchant companies in karums were branching out into Anatolia to trade textiles and tin from Assur for silver. He was succeeded by his son, Ilu-shuma who died around 1974 BC, as recorded in his brick and limestone inscriptions and he appears in the genealogy of his grandson, Erishum I. His name appears in an inscription of Adad-nirari I and one of Shalmaneser I but only in the context of references to his son, Ilu-shuma. Shalim-ahum and his successors bore the title išši’ak Aššur, vice regent of Assur, as well as ensí.

Ilu-shuma or Ilu-šūma, inscribed DINGIR-šum-ma, (died c. 1974 BC) was a king of Assyria in the early 20th century BC. The length of his reign is uncertain, as the Assyrian King List records him as one of the "six kings whose names were written on bricks, but whose eponyms are not known", referring to the lists of officials after which years were named.

His son, Erishum I, is identified as the king who succeeded him and reigned for 40 years (or 30, depending on the copy of the Assyrian King List), followed by Erishum I's son, Ikunum. He titled himself "vice-regent of Assur, beloved of the god Ashur and the goddess Ishtar." The Synchronistic King List records, "eighty-two kings of Assyria from Erishum I, son of Ilu-shuma, to Ashurbanipal, son of Esarhaddon", in the concluding colophon.