Ali ibn Babawayh Qummi

Ali ibn Babawayh Qomi (died 939) was a Twelver Shi'a scholar from the time of the "Ghaybat al-Sughra". He's the father of Shaikh Saduq.
He wrote a letter to Imam Muhammad al-Mahdi, asking for prayer for him to have a child, as doctors had told him he could not have one. Thus his son, Shaikh Saduq, was always called: "Oh you that was born by the prayer of Imam Mahdi!".