Who is Judge Abū Ishāq al-Baghdādi? Thank you.

Abū Isḥāq is a common kunyah (agnomen) among theadis of Baghdad, and among the most prominent of them was Saʿd ibn Ibrāhīm al-Zuhri. He was appointed as a judge in Wasit, then as a judge in ʿAskar al-Mahdi, and he passed away in the year 201 AH at the age of approximately 63 years. He was truthful, and some of the Baghdadis heard from him, and Aḥmad ibn Ḥanbal narrated from him. Imam Aḥmad said of him: "There was no harm in him."