However...

However, though he had all the worldly power, he did not dare do so in the life of Imam Hasan (as). Once he did try to launch a movement to declare Yazeed as his heir apparent but the Iraqi delegation told him clearly that during the life of Imam Hasan (as) they could not give such an allegiance. Dr. Syed Abdul Aziz Salim writes: "Muawiya made up his mind to get allegiance for Yazid, particularly when Moghira had already sent a delegation of the people from Kufa.

However, he waited so that Hasan bin ‘Ali (as) and the sons of the of the Holy Prophet (saw) may not be able to protest against this step. So, he postponed the announcement of the crown prince till after the death of Imam Hasan bin ‘Ali (as)."[