A history of Hadith scholars in cities of the East and of the Levant (until the invasion of the Tatars in the 7th Century AH), by historian Mazin ibn Abd al-Rahman al-Buhsali al-Bayruti. The work demonstrates aspects of the lives and times of the scholars, and the catastrophe of the Tatar invasion which brought destruction of libraries and schools and extermination of Muslim scholars, causing a great loss.