Maybe the user is looking for information on Rijal literature in general. Rijal is a term used in Islamic studies for biographical dictionaries of jurists and scholars. If Al-Kashi refers to the mathematician Ghiyath al-Din al-Kashi from the 14th/15th century, but he was from Samarkand, not Al-Kashi. Wait, perhaps the user is confusing Al-Kashi with a different scholar from the region or time?