The twenty-eighth ruler of Aššur according to the Assyrian King List [http://oracc.museum.upenn.edu/riao/kinglists/assyriankinglist/index.html] (AKL) was Kikkiya; his name is preserved in the Khorsabad List [http://oracc.museum.upenn.edu/riao/kinglists/assyriankinglist/khorsabadlist/index.html] and the SDAS List [http://oracc.museum.upenn.edu/riao/kinglists/assyriankinglist/sdaslist/index.html]. The AKL states that Kikkiya succeeded Sulilu [http://oracc.museum.upenn.edu/riao/fromcolonytocitystate23341809bc/sargonicanduriiiperiods/sulilu/index.html] and was followed on the throne by Akiya [http://oracc.museum.upenn.edu/riao/fromcolonytocitystate23341809bc/sargonicanduriiiperiods/akiya/index.html]; the familial relationships between Sulilu, Kikkiya, and Akiya are not recorded in the AKL. Kikkiya is one of six rulers "[who(se names) appear on] bricks, (but) whose eponyms are not known" (see the introduction to the AKL). Because the composers of the list of Aššur's rulers did not have information on this ruler's līmu eponym [http://cdli.ox.ac.uk/wiki/doku.php?id=assyrian_eponyms_limmu] officials they were unable to calculate the length of his reign. Although it is not known when Kikkiya held authority in Aššur, he is generally thought to have ruled just before, or just after, the end of Ur's dominion over Aššur at the end of the third millennium and, thus, he may have been a governor during the Ur III period.
The wording of the AKL suggests that inscriptions of Kikkiya once existed (on bricks), however, none of these survive today.
Poppy Tushingham
Poppy Tushingham, 'Kikkiya', The Royal Inscriptions of Assyria online (RIAo) Project, The RIAo Project, a sub-project of MOCCI, 2021 [http://oracc.museum.upenn.edu/riao/fromcolonytocitystate23341809bc/sargonicanduriiiperiods/kikkiya/]