I want to know the answer to the following question:
What year saw the death of Abu Hashim?
All the background I'm provided with is that "The Abbasids were members of the Hashim clan, rivals of the Umayyads, but the word "Hashimiyya" seems to refer specifically to Abu Hashim, a grandson of Ali and son of Muhammad ibn al-Hanafiyya.". Is that enough to answer the question?