linguistic:paraphrasing
During the caliphate of Mu'awiya

According to the Shi'a, Husayn was the third Imam for a period of ten years after the death of his brother Hasan in 670 AD. All of this time except the last six months coincided with the caliphate of Mu'awiya. In the nine-year period between Hasan's abdication in AH 41 (660 AD) and his death in AH 49 (669 AD), Hasan and Husayn retreated to Medina, trying to keep aloof from political involvement for or against Mu'awiya. Sentiments in favor of the rule of Ahl al-Bayt occasionally emerged in the form of small groups, mostly from Kufa, visiting Hasan and Husayn asking them to be their leaders – a request to which they declined to respond. When Hasan was poisoned, he refused to tell Husayn the name of his suspect, probably Mu'awiya, in fear of provoking bloodshed. The burial of Hasan's body near that of Muhammad, was another problem which could have led to bloodshed, as Marwan ibn Hakam swore that he would not permit Hasan to be buried near Muhammad with Abu Bakr and Umar, while Uthman was buried in the cemetery of al-Baqi. After the death of Hasan, when Iraqis turned to Husayn, concerning an uprising, Husayn instructed them to wait as long as Mu'awiya was alive due to Hasan's peace treaty with him. Meanwhile, Marwan reported to Mu'awiya the frequent visits of Shias to Husayn. Mu'awiya instructed Marwan not to clash with Husayn, in the same time he wrote a letter to Husayn in which he "mingled generous promises with the advice not to provoke him." Later on, when Mu'awiya was taking allegiance for his son, Yazid, Husayn was among the five prominent persons who did not give his allegiance, as appointing a successor was in violation of Hasan's peace treaty with Mu'awiya. Before his death in April 680, Mu'awiya cautioned Yazid that Husayn and Abd Allah ibn al-Zubayr might challenge his rule and instructed him to defeat them if they did. Yazid was further advised to treat Husayn with caution and not to spill his blood, since he was the grandson of Muhammad.