Ishaq ibn Mansur
أبو عبد الرحمن إسحاق بن منصور
Third generation, died 204 AH. Named in the chains of 40 narrations of the library, 3 in Bukhari, 10 in Muslim, 6 in Abu Dawud.
40narrations name him
8collections
204 AHhe died
In the books of narrators: Truthful, صدوق تكلم فيه للتشيع.