The terms "Pre-Sargonic" and "Post-Sargonic" were used in Assyriology based on the chronologies of Nabonidus before the historical existence of Sargon of Akkad was confirmed. The form Šarru-ukīn was known from the Assyrian Sargon Legend discovered in 1867 in Ashurbanipal's library at Nineveh. The first contemporary reference to Sargon was found on the cylinder seal of Ibni-sharru, a high-ranking official serving under Sargon. Ménant 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 Shamah 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.