Structure and the level of detail (some lists, for instance, provided genealogical information) varied from list to list and purposes were often not only historiographical, but also political.[15] For instance, Assyrian king lists typically recorded the genealogy of the Assyrian kings in great detail as connection to the royal bloodline granted the Assyrian ruler their legitimacy.[16] Though considerably rarer than during previous periods, there are surviving examples of Mesopotamian king lists written in the centuries after the fall of the Neo-Babylonian Empire.[2] The foremost example of a list in regards to the Persian period is the Uruk King List (IM 65066, also known as King List 5), which records rulers of Babylon from Shamash-shum-ukin (r. 668–648 BC) to the Seleucid king Seleucus II Callinicus (r. 246–225 BC).[2][17] The tablet containing the list is fragmentary; only recording the first three Persian rulers (Cyrus, Cambyses and Darius I) before breaking off, with surviving fragments not resuming until the line that records Darius III (r. 336–330 BC).