For the matter of
allegiance to Yazid, Mu'awiyah secretly killed Imam
al-Hasan al-Mujtaba and Sa'd ibn Abi Waqqas.
The question of Yazid's caliphate had occupied the
mind of Mu'awiyah and he saw certain obstacles in
it which he could not overcome. But he used all his
efforts to remove the last obstacles. On the one hand
there was Imam al-Mujtaba the grandson of the Prophet
who was the greatest social and spiritual personality
of the day, and on the other hand there was Sa'd ibn
Abi Waqqa, a great general and a member of the council
of six appointed by 'Umar, and popular with a number
of Muslims.
Abu al-Faraj al-Isfahani, famous historian, writes:
"Mu'awiyah desired people's allegiance for his
son, Yazid. But in this course no obstacles were greater
than al-Hasan ibn 'Ali, and Sa'd ibn Abi Waqqa. In
order to remove these two great obstacles, he secretly
poisoned them both, and they died."(230)
The reason why Imam al-Hasan and Sa'd ibn Abi Waqqas
were at that time regarded as obstacles in the way
of Mu'awiyah's objective, was that Sa'd ibn Abi Waqqas
was the last. remaining member of the council of six
appointed by 'Umar to decide the choice of the successor
to him as caliph.(231) Later on these six men gained
such a high reputation that each of them was considered
worthy of being chosen as caliph. But Imam al-Hasan,
in addition to his particularly great virtue and fine
qualities, had stipulated in his truce with Mu'awiyah
that after the latter's death he should be caliph,(232)
and Mu'awiyah was not allowed to nominate any other
successor for himself.(233)
Historians have not described how Sa'd ibn Abi Waqqas
was killed. They only state that his death was due
to poisoning. But in connection with the martyrdom
of Imain al-Hasan, there exists several pieces of
evidence, which clarify this tragic matter.
al-Mas'udi writes: Ju'dah, daughter of al-Ash'ath
ibn Qays al-Kindi poisoned Imam al-Hasan with a poison
sent secretly to her by Mu'awiyah. He had sent her
a message that if she could kill Imam al-Hasan through
an effective plan, he would reward