Little is known about the king, with the only Babylonian reference to him from an expedition he led against "the Sealand", a region synonymous with
Sumer, ca. 1465 BC, which is described in the
Chronicle of Early Kings. The excavation conducted by Béatrice André-Salvini (1995) in Bahrain, ancient
Dilmun, yielded around 50 tablets some of which dated to Agum III, whose 3rd and 4th years are attested in the dates of texts found in the area of
Qal’at al-Bahrain, when Kassite rule may have extended to the island. It has been suggested that following on from his successes conquering the Sealand, he crossed over to Bahrain, constructed a new palace and installed a local bureaucracy and by his 3rd and 4th years administrative documents began being dated to his reign. A problem arises with this theory due to the date formula. The later kings
Kadašman-Ḫarbe I and
Kurigalzu I each have texts dated using the archaic “year name” style and it is not until their successors,
Kadašman-Enlil I and
Burna-Buriaš II that regnal years count from the accession of a king. ==Inscriptions==