[1] Details of Belassunu's life are known from surviving letters from the former royal archive at Tell-el-Rimah.
This marriage appears to have been unhappy, as she was ill-treated by her husband, as recorded in letters preserved as clay tablets discovered by archaeologists amongst the Iltani archive.
[2][3][4] This mistreatment was such that she did not wish to live with her husband, and requested to move to the court of her brother in law.
[3] The assertion that Belassunu had been a secondary wife to Zimrilim, king of Mari has now been proved incorrect.
Eventually she retired to her father's court at Karana, being escorted there under the protection of her brother-in-law Aqba-Hammu.