Indeed, Imam al-Askari(a.s.), like his noble fathers, was a prominent scholar and an Imam whom no one could ignore. He (A.S.) was the chief of religious scholars, an ideal of worshippers, a leader of politics and opposition, and towards whom the hearts of people were adhered with love and respect.
Inspite of the existence of the brutal terrorism of the Abbasid rule, and their political hostility towards Ahlul-Bayt (A.S.), and the continuous pursuit of authorities for him and his followers, and throwing them in prisons and jails, the caliphs of his time could not hide his personality or weaken his scientific and political role and his social status. Thus, the spiritual authority of the Holy Imam(A.S.) was imposed upon the rulers and the opponents of his time.
Ahmad bin Abdulla bin Khaqan, being an opponent of Imam al-Askari (A.S.), narrated a full description about his social and political status and position:
Ibn Shahr Ashub said:
"Hussein bin Muhammad Ash'ari and Muhammad bin Ali said: During his assembly one day the Shias and their beliefs were mentioned. Ahmad bin Abdulla bin Khaqan was in charge of estates and the land tax in Qom. He was the severe enemy of the descendants of Ali bin Abi-Talib(A.S.), who said: 'I had not seen a man from the Sayyids like al-Hassan bin Ali bin Muhammad bin Ali al-Redha(A.S.). Once, the Imam's servant visited my father and said: Abu Muhammad bin al-Rida is standing at the door. Therefore, he permitted them to enter, and welcomed him (the Imam).
Then, the Caliph made him sit down in his oratory (place of Prayer) and started to talk with him and asked for sacrifice of himself for the Imam.
When the Imam wanted to leave, he (my father) bid farewell to him. Then, I asked my father about him (the Imam) and he replied: 'I my son! This is the Imam (leader) of Shias and if the office of leadership was to be taken from our caliphs i.e. the family of al-Abbas, no one among the family of Bani Hashim would be more entitled to it than him (the Imam) because of his great merit, his self restraint, his modesty, his fasting, his prayer, his asceticism, his devotion (to Allah), and all of his high morals and his righteousness.' "Indeed, I always asked about him, they glorified him and mentioned his charismas. He added saying: 'I have never seen anyone who is more plentiful in knowledge and manner, nor sweet in tongue than Hassan al-Askari(A.S.).
Because of the Holy Imam's great status, political position and his standing at the top of political opposition at that time, the, then, authorities not only imposed a house arrest on him, but, also forced him to attend the office of the caliphate on Mondays and Thursdays every week in the city of Samarrah, the military garrison capital city of Abbasid administration.
In this regard, one of the companions of the Holy Imam (A.S.) said:
"We held a meeting in the district of "al-Askar", then, we waited for the day of Abu Muhammad's (the Holy Imam) going by, instead, he (a.s.) sent a letter in which he wrote the following: 'No one should greet me, nor refer to me with his hand nor gestures, because you would not secure yourselves."
The great position of the Imam (a.s.) can be shown by the following historical document in which he describes the people's conditions during the Holy Imam's martyrdom:
"When the news of his (the HolyImam) martyrdom was spread, Samarra' became on uproar. The markets were empty. Bani (the family) Hashim, the military leaders, the secretaries, the judges, the attestators and the rest of the people rode to his funeral. On that day, Samarra' looked like the (day of) Resurrection.."

Source:Mouood