About 405/1015 Ismaili da"i Hamid al-Din al-Kirmani composed a treatise he called Lights to Illuminate the Proof of the Imamate (al-Masabih fi ithbat al-imama) in the bold hope of convincing Fakhr al-Mulk, the Shi"i wazir of the Buyids in Baghdad, to abandon the Abbasids and support the Fatimid caliph al-Hakim. This work offers a translation.