Nineveh. A contemporary reference to Sargon thought to have been found on the cylinder seal of Ibni-sharru, a high-ranking official serving under Sargon. Joachim Menant published a description of this seal in 1877, reading the king's name as Shegani-shar-lukh, and did not yet identify it with "Sargon the Elder" (who was identified with the Old Assyrian king Sargon I). In 1883, the British Museum acquired the "mace-head of Shar-Gani-sharri", a votive gift deposited at the temple of Shamash in Sippar. This "Shar-Gani" was identified with the Sargon of Agade of Assyrian legend. The identification of "Shar-Gani-sharri" with Sargon was recognised as mistaken in the 1910s. Shar-Gani-sharri (Shar-Kali-Sharri) is, in fact, Sargon's great-grandson, the successor of Naram-Sin. It is not entirely clear whether the Neo-Assyrian king Sargon II was directly named for Sargon of Akkad, as there is some uncertainty whether his name should be rendered Šarru-ukīn or as Šarru-kēn(u). Chronology Primary sources pertaining to Sargon are sparse; the main near-contemporary reference is that in the various versions of the Sumerian King List. Here, Sargon is mentioned as the son of a gardener, former cup-bearer of Ur-Zababa of Kish. He usurped the kingship from Lugal-zage-si of Uruk and took it to his own city of Akkad. Note that the Weidner chronicle has Sargon ruling directly after Ur-Zababa and does not mention Lugal-zage-si. Various copies of the king list give the duration of his reign as either 40 or 54-56 years. Numerous fragmentary inscriptions relating to Sargon are also known. In absolute years, his reign would correspond to c. 2334–2279 BC in the middle chronology. His successors until the Gutian conquest of Sumer are also known as the "Sargonic Dynasty" and their rule as the "Sargonic Period" of Mesopotamian history. Foster (1982) argued that the reading of 55 years as the duration of Sargon's reign was, in fact, a corruption of an original interpretation of 37 years. An older version of the king list gives Sargon's reign as lasting for 40 years. Thorkild Jacobsen marked the clause about Sargon's father being a gardener as a lacuna, indicating his uncertainty about its meaning. Ur-Zababa and Lugal-zage-si are both listed as kings, but separated by several additional named rulers of Kish, who seem to have been merely governors or vassals under the Akkadian Empire. The claim that Sargon was the original founder of Akkad has been called into question with the discovery of an