Abu Ja'far Muhammad ibn Ya'qub al-Kulayni was a prominent Islamic scholar born in the 9th century CE in Kufa, Iraq. He is best known for his work in the field of Hadith compilation, particularly for his influential book, Al-Kafi, which is considered one of the four major collections of Shia Hadith. Al-Kulayni dedicated his life to gathering and verifying traditions related to the teachings of the Prophet Muhammad and the Imams. Al-Kulayni traveled extensively throughout the Islamic world, seeking knowledge from various scholars and collecting Hadith. His meticulous approach to documentation and emphasis on authenticity made his works highly respected among Shia Muslims. His contributions significantly shaped the understanding of Islamic teachings and continue to be referenced by scholars and students of Islamic studies today.