The people were extremely fond of him...
The people were extremely fond of him, and they benefited greatly from his guidance, his knowledge and his awareness. Through him they found the right path in life. Al-Mutawwakkil, the bloodthirsty Abbasid tyrant, was envious towards al-Imam al-Hadi (a.s) and fearful of the Imam's powerful influence. For this reason he summoned the Imam from al-Madinah to Samarra, in present day Iraq, and placed him under surveillance in an army camp. Al-Imam al-Hadi (a.s) lived in this world for forty years.
He was always opposed to the oppression of the ruling Abbasids, and used to condemn their tyranny and oppression. The result was that on 3rd Rajab, 254 A.H, he was martyred in Samarra through poison. His sacred body was buried in Samarra. May eternal peace be upon him. Hazrat Muslim ibne Akeel (as) Imaam Hussain's caravan left Madina on 28th Rajab, 60 A.H. and reached Mecca on the fourth of Shabaan. Imaam had not yet made up his mind on where to go.
For the time being he decided to stay in Mecca at least until the month of Dhul-Hajj and perform the pilgrimage. The people of Kufa in Iraq heard of what had happened in Madina. Kufa was an important Shiah centre. The Shiahs there had long suffered under Muawiya. They feared even greater sufferings under Yezid. They felt that slowly Islam would be totally destroyed by the greed for power and glory of these two men. They were anxious to preserve the teachings of the Holy Prophet.
They needed an Imaam who would teach the tafseer of the Holy quraan and relate to them the true sayings, ahaadees, of the Holy Prophet.They a held a meeting in the house of Sulayman bin Surad and decided to write a letter to Imaam Hussain inviting him. In this letter they wrote: "We invite you to come to Kufa as we have no Imaam to guide us. Through you Allah will unite us on the path of truth." A messenger took the letter to Mecca and gave it to Imaam Hussain.
A few days later the people of Kufa sent an emissary, a special messenger, to Imaam to persuade him to go to Kufa. His name was Qais ibne Musheer as-Saydawi. There followed hundreds of other letters and many special emissaries from the people of Kufa to Imaam Hussain.The Governor in Kufa was a man called Nu'amaan bin Basheer. Although he was a follower of Muawiya and Yezid, he was not by nature a cruel man. The people of Kufa believed that Imaam would be safe in Kufa.