Mut-bisir or
Mutu-bisir (in Akkadian Cuneiform:
mu-ut-bi-si-ir, in transliterated
Amorite language:
mut-biśir, "man of Biśri";
fl. 19th century BC) was a senior military official to the Amorite king
Shamshi-Adad I.
His name appears repeatedly in the
Mari letters, and means "man of Biśir", referring to the desert region around the
Jebel Bishri.
[Cinzia Pappi (2006). " The Jebel Bishri in the Physical and Cultural Landscape of the Ancient Near East". Kaskal, Volume 3. p. 248.] In these letters, Anson Rainey describes him as "frequently mentioned in connection with troops located near the '
Euphrates."
In one such letter, from Mut-biśir to Shamshi-Adad, he was the first recorded individual to refer to by name (Akkadian, ki-na-aḫ-nu(m)). In this letter, Mut-biśir describes his soldiers and opposing Canaanite forces as tensely watching one another.[Anson F. Rainey (1979). "Toponymic Problems (cont.)", Tel Aviv, 6:3-4, 158-162, DOI: 10.1179/033443579788441172. p. 158.]
His residence in Mari seems to have eventually been given to Shibti, the daughter of Shamshi-Adad, and this household became a major supplier of foods to the royal palace.