Šamšī-Adad II was a second millennium king of Aššur whose reign lasted for six years according to the Assyrian King List [http://oracc.museum.upenn.edu/riao/kinglists/assyriankinglist/index.html] (AKL); he was the fifty-seventh ruler according to that chronographic text. He came to power immediately after his father Erišum III [http://oracc.museum.upenn.edu/riao/fromsamsiaddutomittanicilent18081364bc/belubanidynasty/erishumiii/index.html] and was succeeded by his own son Išmē-Dagān II [http://oracc.museum.upenn.edu/riao/fromsamsiaddutomittanicilent18081364bc/belubanidynasty/ishmedaganii/index.html]. The Synchronistic King List [http://oracc.museum.upenn.edu/riao/kinglists/synchronistickinglist/index.html#List] (SKL) records that eight Kassite kings ruled Babylon during his tenure as king. It is possible, however, that this rather high number of Babylonian kings is due to the stylised nature of the SKL (Brinkman 1968, 29). To date, no royal inscription of his has yet been discovered.
Poppy Tushingham
Poppy Tushingham, 'Šamšī-Adad II', The Royal Inscriptions of Assyria online (RIAo) Project, The RIAo Project, a sub-project of MOCCI, 2021 [http://oracc.museum.upenn.edu/riao/fromsamsiaddutomittanicilent18081364bc/belubanidynasty/shamshiadadii/]