Lugalannatum is known from a deposit tablet, now in the Louvre Museum, in which he mentions the rule of Si'um, king of the Gutians.

[3][1] The tablet was first published in 1911, and first revealed the existence of a Gutian dynasty of Sumer.

[2][4] The tablet is written in the Akkadian language following the influence of the former Kingdom of Akkad, and uses Sumerian cuneiform characters for their phonetical value.

[1] It reads: Lugal-an-na-tum/ pa-te-si/ GIS UH KI-ge/ GIS UH Kl/ ba-ba-a/ 30 + 5 mu/ sal-la-ba/ ê pa GIS UH Kl/ sal-sal/ temen-bi/ ki-a ni-si-si/ me-bi sag-ba/ si-ba-ni-sa/ ud Ba-si-û-um/ lugal Gu-ti-um kam Lugalannatum, patesi of Umma, (as) Umma for 35 years abounded in liberalities, Ê PA, the rich temple of Umma, its foundations he established, he ensured rites inside, and set up rules, at the time of Ba-siûm, king of Gutium.

[1] The text shows the allegiance of Lugalannatum, as simple Governor of Umma, towards the Gutian king of Sumer.