Libit-Ishtar was the last member of Ishbi-Ura's family to occupy the throne of Isin. He reigned for eleven years, and with his successor, Ur-Ninib, the throne passed to a different family. We may probably connect this change in the succession with the fact that about this time an independent kingdom makes its appearance in Larsa and Ur. For another son of Ishme-Dagan, named Enannatum, who was chief priest in the temple of the Moon-god at Ur, has left us an inscription upon clay cones, in which he records that he rebuilt the temple of the Sun-god at Larsa for the preservation of his own life and that of Gungunu, the king of Ur.[19] Gungunu himself, upon a brick-inscription commemorating his building of the great wall of Larsa, claims to be king of that city and also of the whole of Sumer and Akkad. It would therefore seem that towards the close of Libit-Ishtar's reign, or immediately after it, Gungunu established an independent kingdom with its capital at Larsa. It is strange that in the city of Ur, which was under his control, a son of Ishme-Dagan should continue to hold, or should be invested with, the office of chief priest, and there is something to be said for the suggestion that Libit-Ishtar's fall may not have been brought about by any active hostility on the part of Gungunu, but by a foreign invasion from Elam.[20] According to this view Isin was captured by the invaders,[21] and in the confusion that followed Larsa secured the hegemony in Sumer. However this may be, it is probable that Gungunu's authority was of brief duration; for Ur-Ninib is represented by the dynastic list as Libit-Ishtar's immediate successor, and in an inscription of his own upon a brick from Nippur he not only claims the titles of King of Isin and King of Sumer and Akkad, but, like the earlier king Ishme-Dagan, styles himself Lord of Erech, and the patron of Nippur, Ur, and Eridu.[22] We may therefore assume that Ur-Ninib was successful in re-establishing the power of Isin, and in uniting once more the whole of Sumer and Akkad under its sway. After a reign of twenty-eight years he was followed by his son Bûr-Sin II., who bore the same titles as his father and mentions the same list of cities as having enjoyed his special favour. His comparatively long reign of twenty-one years is a further indication that Ur-Ninib's restoration of order had been effective. The last two descendants of Ur-Ninib to occupy the throne of Isin were sons of Bûr-Sin. Of Iter-kasha, who reigned for only five years, we know nothing, but the name of his brother Ura-imitti, and the strange manner in which he met his death after appointing his successor, have been preserved in later Babylonian tradition.