In addition...
In addition, Mamoon married his daughter to Ali Al-Reza -asws and insisted on him -asws to become his successor, but Imam Ali Al-Reza -asws refused and when compelled, Ali Al-Reza -asws accepted it under the conditions that he -asws will neither be involved in Mamoon’s governance nor act as successor but only in that case if he -asws lives after Masoom -asws . He (Mamoon) was pleased with this, but would always envy the Imam -asws .
Mamoon, as a result, organised a number of religious debates in his court, with his agenda of defaming and snubbing Al-Reza -asws . These gatherings involved famous and renowned scholars coming from atheist, Christian, Jewish, and Sunni backgrounds to question the Imam -asws .
When the results of such debates were not to his likings, Mamoon attempted to publicly humiliate the Imam -asws through the spells and trickeries of both local and international magicians – trying to adapt the approach of Pharaohs! Mamoon, feeling helpless against the Divine Powers Bestowed by Allah -azwj to the Imam -asws , found no other solution to his devious wishes but to poison Imam Ali Al-Reza -asws , in a similar fashion to that of his father – Rashid who poisoned Imam Musa-e-Kazim.
Hence, both the 7 th and 8 th Imams -asws (Al-Kazim and Al-Reza) were poisoned and killed by the two Abbasid caliphs (Haroon and Mamoon Rashid) – there is no evidence that they -asws had either supported Abbasid governments or benefited for them in any way – whatsoever. These are the blatant lies orchestrated by the Ismailis propaganda!
The second allegation is that the 7 th and 8 th Imams named their daughters after the name of Aysha (wife of Rasool Allah -saww ), who is considered a Nasabi by Shias, as reflected by her hostility against Imam Ali -asws (e.g., war of camel)!
This a flawed allegation, initially coming from Sunnis who alleged that Ali -asws Ibn Abi Talib -asws named his -asws sons after the names of Abu Bakr and Umar and Usman, hence suggesting that they were on good terms and respected each other – a superficial and imaginary stance which is contrary to the statements of Ali Amir ul-Momineen -asws , as found in several sermons and Ahadith where Imam -asws has denounced the first, second and the third Muslim caliphs for their injustice and hostilities against Ahl Al-Bayt -asws !