Demise:

There is a difference of opinion regarding the year in which Hazrat Sa’d (radhiyallahu ‘anhu) passed away.

After recording the different views, Haafiz ibn Hajar ‘Asqalaani (rahimahullah) has mentioned that the most famous and well known view is that Hazrat Sa’d (radhiyallahu ‘anhu) passed away in the year 56 A.H. (Isaabah 3/62)

Haafiz Mizzi (rahimahullah) has preferred the view that Hazrat Sa’d (radhiyallahu ‘anhu) passed away in the year 55 A.H. ‘Allaamah Zahabi (rahimahullah) has expressed this to be the correct view. (Tahzeeb-ul-Kamaal 10/313, Siyar A’laam min Nibalaa 3/77)