I want to know the answer to the following question:
Where did Marwan die?
All the background I'm provided with is that "Kufa fell to the Hashimiyya in 749, the last Umayyad stronghold in Iraq, Wasit, was placed under siege, and in November of the same year Abu al-Abbas was recognized as the new caliph in the mosque at Kufa.[citation needed]". Is that enough to answer the question?
Answer: no