All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
We have previously explained that Marwaan Ibn Al-Hakam was not a Companion according to the most preponderant opinion of the scholars and it is not true that he killed ‘Aa’ishah . For more benefit in this regard, please refer to Fatwa 140015.
The historians and biographers stated that Marwaan had committed atrocities and abominable acts. Ibn Hazm said: “Marwaan Ibn Al-Hakam was the first to cause dissension amongst the Muslims without a sound reason [i.e. without having any doubt or misunderstanding of Islamic texts – from the Quran or the Sunnah] and he killed An-Nu’maan Ibn Basheer, the first person who was born in Islam, and he revolted against Ibn Az-Zubayr after he had pledged allegiance and obedience to him.”
Besides, Ibn ‘Abd-el-Barr said: “There is no difference of opinion among the trustworthy scholars that Marwaan killed Talha (Ibn Ubydillaah ) while he was in his army at that time.”
Moreover, Ath-Thahabi said: “…And he did grave serious acts – we seek refuge in Allaah from that – as he shot Talha with an arrow and he did such and such….” He further said (in another place): “…and he killed Talha during the Battle of the Camel, while he himself escaped death - I wish he had not escaped death…”
Also, among his grave errors is what you mentioned that he contradicted the Sunnah on the Day of ‘Eed, as he gave the Khutbah before the ‘Eed prayer while the Sunnah is to perform the ‘Eed prayer first and then deliver the Khutbah, and he did not want to listen to those who objected to him in this regard.
Finally, it should be mentioned that a Muslim should consult the trustworthy scholars in issuing a judgment on people, especially the first generation, because the books on Maghaazi (first battles of Islam), biography and history are full of falsehoods and fabricated stories.
Allaah Knows best.