Aḥmad b. Mūsā b. Jaʿfar (d. ca. 203/818), was one of the sons of Imam Mūsā b. Jaʿfar al-Kāẓim, and was known as ‘Sayyid al-Sādāt’ and ‘Shāh Chirāgh’. There is very little biographical information about him, and the historical sources only refer to parts of his life. Regarding Aḥmad’s relationship with his father, the sources show that Mūsā b. Jaʿfar al-Kāẓim treated him with g…