Thiqat Ul-Islam
Kulayni is also known by this title. This title has not been bestowed upon any other Shia scholar. Thiqah, in ilm ar-Rijal means a narrator of the tradition who is reliable. The Shi'ah scholars Shaykh Tusi, Muhammad Baqir Majlisi and Qazi Nurullah Shustari are among those who remembered Kulayni by this name. Kulayni died in 328 A.H. or 329 A.H. (939 or 940 A.D.).
Read more about this topic: Muhammad Ibn Ya'qub Al-Kulayni