The Kingdom of Upper Mesopotamia (also Royaume de Haute-Mésopotamie and Upper Mesopotamian Kingdom) was an ancient Near East kingdom in Mesopotamia during early 2nd millennium BC, part of the rise of Amorite power in the region. It is largely known from texts found at Mari, Chagar Bazar, Tell Bi’a (Tuttul), and Tell Shemshara. It was bordered on the west by the Yamhad kingdom and on the east by the Eshnunna kingdom, Babylon being a minor power at that time. At the height of its power it controlled a wide swath of Mesopotamia the largest since the fall of the Ur. Its main leadership figures were Shamshi-Adad I and his sons Ishme-Dagan I and Yasmah-Adad. After a period of decline following the death of Shamshi-Adad I, its territory was largely absorbed by Mari, Yamhad, and Eshnunna leaving a small rump state centered on Ekallatum. The later rulers of the Middle Assyria attempted to make the much earlier Kingdom of Upper Mesopotamia a part of the historical backstory for their reign. This type of revisionist history is not unusual and was often practiced by regimes in this period to support their right to rule. The much later literary composition Assyrian King List thought to have been written in the time of Assyrian ruler Ashurnasirpal I mentions the rulers of Upper Mesopotamia and attempts to legitimize this. The Assyrians also rebranded Šamši-Adad as Šamši-Adad I and Išme-Dagan as Išme-Dagan I to fit them into a mythical list of Assyrian rulers.Siddall, Luis Robert, "The Genealogy of Adad-nirari III, the Identity of the Ila-kabkabis of the Assyrian King List and the Status of the ‘Legitimisation’ Hypothesis", Orientalia, pp. 368-378, 2007Valk, Jonathan, "The Origins of the Assyrian King List", Journal of Ancient Near Eastern History 6.1, pp. 1-17, 2019
The Kingdom of Upper Mesopotamia grew out of the as yet unlocated city of Ekallatum.Ziegler, Nele, "Le royaume d’Ekallâtum et son horizon géopolitique", in Dominique Charpin and Jean-Marie Durand (eds), Recueil d’ études à la mémoire d’ André Parrot, ed. Dominique Charpin and Jean-Marie Durand, FM 6, Paris: SEPOA, pp. 211–274, 2002 It was largely built by its first ruler, Amorite Shamshi-Adad I and Ekallatum was the kingdoms first political capital. Later the political capital was moved to Šubat-Enlil. Despite its great scope the kingdom was without many features of many other Mesopotamian kingdoms like centralized irrigation, taxation, or religion. Nor was there a state language with Amorite, Hurrian, and Akkadian all in use. The full range of Mesopotamian gods were observed including Dagan, Assur, Istar, and Enlil. Early in the formation of the kingdom the cultic center of Assur was conquered and later became one of the kingdoms cultic sites along with Nurrugum, Mari, and others. Shamshi-Adad I once complained in a text to his son Yasmah-Adad that Mari and Assur "are full of gods", (Mari u Assur-ma ša ilānī malû).Zaia, S., "Applying Heterarchy Theory to Ancient Mesopotamian Religions: A View from Assur", Numen, 70(5-6), pp. 598-624, 2023
Polities conquered by Upper Mesopotamia abandoned the traditional method of dating by year names and switched to the Ekallatum system of using eponyms. With the decline of the kingdom, most of those polities returned to the traditional system aside from the area that later became Assyria where the eponym dating system remained and continued well into the 1st millennium BC. Polities switching to eponym dating included Mari and the currently unlocated Tigunānum.Bloch, Yigal, "The Conquest Eponyms of Šamšī-Adad I and the Kaneš Eponym List", Journal of Near Eastern Studies 73.2, pp. 191-210, 2014Ziegler, Nele, "The Eponym Chronicles from Mari–New Edition, Photographs and Comments", Eclipses, Volcanoes and Eponyms. New perspectives on the chronology of the early second millennium BC in the Near East, pp. 16-46, 2026Ziegler, Nele, "The Upper-Mesopotamian, or so-called “Šamšī-Adad Calendar”" ,Calendars and Festivals in Mesopotamia in the Third and Second Millennia BC 9, pp. 117-130, 2021Pongratz-Leisten, Beate, "Production of Knowledge in Contact Zones: Mari and Tigunānum in the Old Babylonian Period", Material Worlds: Interdisciplinary Approaches, pp. 33-51, 2016 Based on an analysis of these eponyms it has been suggested that Shamshi-Adad I lived to an age of 70.Lacambre, Denis, "New data about two eponyms of the time of Samsī-Addu: the cases of Hayamalik and Ahiyaya", Eclipses, Volcanoes, and Eponyms: New Perspectives on the Chronology of the Early Second Millennium BC in Mesopotamia 43, pp. 100-116, 2025 Interestingly there are a few traditional year names of Yasmah-Adad while he ruled as governor at Mari, presumably before Mari transitioned to a eponym system. These include "Year in which Samsi-Addu seized Mar-Addu and built there the temple of Dagan" and "Year in which Yasmah-Addu brought Nergal into his temple".Year names and Eponyms of Yasmah-Addu
History Almost all contemporary textual sources for the kingdom come from cuneiform texts found at Mari where correspondence of Yasmah-Adad with Shamshi-Adad I and Ishme-Dagan I were discovered along with smaller amounts at Chagar Bazar (possibly Ašnakkum), Tell Bi'a (possiblu Tuttul) and Šušarra.McMahon, Augusta, Carlo Colantoni, and Miranda Semple, "British Excavations at Chagar Bazar, 2001-2", Iraq 67.2, pp. 1-16, 2005Rattenborg, Rune, "Land of Behemoths: Re-Casting Political Territories of the Middle Bronze Age Jazirah", New Agendas in Remote Sensing and Landscape Archaeology in the Near East, pp. 202-212, 2020 Ekallatum has not yet been found and few relevant cuneiform texts have yet been uncovered at Šubat-Enlil (the excavators at the site focused on earlier periods and not the 2nd millennium BC). The extant Šubat-Enlil texts date from after the death of Shamshi-Adad I and had been used as construction fill. They dated a few generations later and concerned two local rulers of Šubat-Enlil. It is thought that some of the more important Mari texts were removed by officials of Hammurabi after Babylon's conquest of that city and its then ruler Zimri-Lim. Some of the texts from the time of the rule of Yasmah-Adad found at Mari had been kept there well after the return of local rule. The texts found at Šušarra are of its ruler Kuwari, a vassal of Upper Mesopotamia.Eidem, Jesper and Michel, Cécile, "Some Mesopotamian Challenges: A History Based on Tablets Unevenly Distributed in Time and Space", The Ancient World Revisited: Material Dimensions of Written Artefacts, edited by Marilina Betrò, Michael Friedrich and Cécile Michel, De Gruyter, pp. 31-48, 2024
The kingdom grew to the west with the defeat of Mari under its ruler Sumu-Yamam. The conflict had begun earlier as shown by year names of the previous Mari ruler Yahdun-Lim "Year in which Yahdun-Lim set on fire the harvest of the land of Samsi-Addu" and "Year in which Yahdun-Lim was victorious against the army of Samsi-Addu at the gate of Nagar".Year Names of Yahdun-Lim Other polities in that region such as that at Tell Barri and Tell Leilan were also brought into the kingdom.Orsi, Valentina, "Tell Barri before Kahat", STUDIA CHABURENSIA 3, pp. 89-108, 2012 Šamši-Adad claimed to have visited the Mediteranean Sea, eumulating Naram-Sin of Akkad with who he linked himself saying, in a temple inscription, "I erected a stele (inscribed) with my great name in the country Lab’an on the shore of the Great Sea.".de Fátima Rosa, Maria, "The importance of the Mediterranean in the Syro-Mesopotamian Kingdom of Mari in the Amorite period", Mediterranean Studies 30.1, pp. 3-24, 2022 Nineveh, then part of the kingdom of Nurrugum, fell after a few weeks and the city of Nurrugum, extending to both sides of the Tigris River north of Ekallatum, fell after a year long siege with many of its inhabitants absorbed in the Kingdom of Upper Mesopotamia army. Shamshi-Adad I began major religious construction in the newly captured Nineveh including the Ištar Emenue temple and the adjacent E-kitus-kug ziggurat.Aljuboori, Ali Y., "A New Source of a Stone Cylinder Describing the Rebuilding of the Temple of Ištar at Nineveh by Šamši-Addu I", Journal of Cuneiform Studies 68.1, pp. 9-13, 2016 An inscription read:
The Amorite Yaˀilānum tribe that lived in that region was completely destroyed.Bonacossi, Daniele Morandi, et al., "The Italian-Kurdish excavations at Gir-e Gomel in the Kurdistan region of Iraq", Mesopotamia: rivista di archeologia, epigrafia e storia orientale antica 53, pp. 67-162, 2018Ziegler, Nele, "The conquest of the holy city of Nineveh and the kingdom of Nurrugûm by Samsî-Addu", Iraq 66, pp. 19-26, 2004
At that point the kingdom to the east extended not far past Assur. Later the Kingdom of Upper Mesopotamia began expanding to the east beginning with the sack of Arrapha. Late in his reign Shamshi-Adad I, having formed an alliance with Dadusha of Eshnunna, conquered the Hurian plain east of the Tigris River including Arrapha and Qabra (unlocated but thought to be Kurd Qaburstan).Bach, Johannes, "The Yaˀilānum War: A Chronological Proposal", Zeitschrift für Assyriologie und vorderasiatische Archäologie, vol. 116, no. 1, pp. 18-32, 2026 The Hurian Turukkean alliance further east then collapsed, Eshunna to the north also expanding at this time, and Šušarra under its ruler Kuwari became a vassal of Upper Mesopotamia to gain protect from Gutium to the east. That region later rose in revolt, with Susarra being destroyed, and Išme-Dagan had to defeat an army of 10,000 men. At that point, Upper Mesopotamia partially withdrew from the region and resettled its supporters there near Qabra.Eidem, Jesper, "The Kingdom of Šamšī-Adad and its Legacies", Constituent, Confederate, and Conquered Space: The Emergence of the Mittani State, edited by Eva Cancik-Kirschbaum, Nicole Brisch and Jesper Eidem, Berlin, Boston: De Gruyter, pp. 137-146, 2014 At this time the city of Qatna under its ruler Ishi-Addu was a strong ally. Dam-Hurasi, the daughter of Ishi-Addu married Yasmah-Adad, son of Shamshi-Adad I, who at that time ruled the city of Mari for his father. Amut-pi'el II, the successor of Ishi-Addu, shifted the allegiance of Qatna to Zimri-Lim of Mari.Durand, J., "The Southwest of the Near East According to Mari: The Example of Qaṭna", in “A Community of Peoples”, Leiden, The Netherlands: Brill, pp. 89–99, 2022Wasserman, N., & Bloch, Y., "The Kingdom of Qaṭna", in The Amorites, Leiden, The Netherlands: Brill, pp. 404–423, 2023 In a joint action with Babylon and Eshnunna the cities of Diniktum and Malgium were also taken.de Boer, Rients, "Malgum, A Synthesis", Journal of Cuneiform Studies 75.1, pp. 13-26, 2023
When the kingdom had reached its full size, Shamshi-Adad I retired to Šubat-Enlil leaving the day to day running of the kingdom to his sons Ishme-Dagan I in Ekallatum ruling the regions to the east and Yasmah-Adad in Mari those to the west though on occasion he left to personally deal with the aggression of Yamhad. Yasmah-Adad ruled in Mari for about 20 years. The death of Šamši-Adad marked the beginning of the decline of the Kingdom of Upper Mesopotamia. His death was so important in the region that it was marked by the 5th year name of Eshnunna ruler Ibal-pi-el II "Year Samsi-Addu died".- Year Names of Ibal-pi-el II - CDLI After the death of Shamshi-Adad I, much of its territory to the west was conquered by Mari, after forcing out Yasmah-Adad, and Eshnunna absorbed the remainder in the west. Ishme-Dagan I continued as ruler of the remaining rump state, essentially the city and area of Ekallatum.Feliu, L., & Watson, W. G., "The Old Babylonian Period", in The God Dagan in Bronze Age Syria, Leiden, The Netherlands: Brill, pp. 62–213, 2003 In a text from that period, Shamshi-Adad I called himself