High Quality Content by WIKIPEDIA articles! Abu Ja'far Muhammad ibn Ya'qub ibn Ishaq al-Kulayni Al-Razi (250 AH/864 CE - 329 AH/941 CE). Details of Kulayni s life are not available therefore his date of birth is not ascertained. He was the foremost Shia compiler of hadith following into the footsteps and the traditions of Imams of Ahl al- Bayt. Al-Kulayni is the author of Kitab al-Kafi- source book of Shia ahadith. His full name was Abu Ja'far Muhammad b. Ya'qub b. Ishaq al-Kulayni al- Razi. Kulayni or also Kulini was born in a village named Kulayn or Kulin in Iran. His father Mulla Yaqub al-Kulayni s grave is known to exist at Rey, Iran. Kulayn was a small town or village situated near Rey, present day Tehran (Ray is now a suburb of Tehran).