This is an inquiry into the life of Imam ‘Ali b. Musa’ al-Ridha’, the eighth Imam from the Household of the Prophet. The text includes a biography, a detailed history of his life and death, a throughout research of his works, debated and discussions, and his doctrinal researches, a collection of his wise sayings and lastly the Ziyarat of the Imam with a brief description of the benefits of its recitation.