Hazrat Ahmad bin Musa (a.s.) and Hazrat Bibi Hakimeh (a.s.) were the children of Imam Musa Kazim (a.s.), who entered southwestern Iran with the Bani Hashim caravan during the reign of Imam Reza (a.s.) His arrival in the south of Iran and the province of Kohgiluyeh and Boyar Ahmad caused the Sadat Mousavi and Razavi families to live throughout this region from the south of Iran and the province of Kohgiluyeh and Boyar Ahmad has a high percentage of Shia Imamia and Sadat. Despite the fact that several centuries have passed since their arrival and then their martyrdom in the region, the personality traits, virtues and role of these imams in the history of Imamate and expansion of Shiism in the south of Iran have not yet been discussed. In this article, by referring to historical sources, the explanation of his role in preserving and protecting the sanctity of the province and the spread of Shiism in the south of Iran, especially in the province of Kohgiluyeh and Boyar Ahmad, has been discussed. The role of his presence and the accompanying delegation of Imamzadegan as a respectable Imamzadeh is investigated in Shia historical and hadith sources and then the impact of his presence and the accompanying Imamzadegan on the condition of the people of Kohgiluyeh and Boyer Ahmad is examined. The expansion of Shiism in the south of Iran is one of his other distinctive features.