Short Biography of Imam Mohammad Taghi AS
He was born either on the 19th of Ramadhan, or 10th of Rajab of the year 195, (811 Gregorian calendar), in the city of Medina. His age had been nine years old at the time of his father’s death.
When Imam Reza AS was martyred, many doubted the Imamat or spiritual leadership of Imam Taghi because he was still too young. But in the pilgrimage or Haj ceremony of the same year, when Muslims gathered from all around the world, they would go and visit the young imam and ask him questions of every kind in the several days of Haj to determine the truth of his Imamat. Imam Mohammad Taghi’s correct answers to all their questions, affirmed his true claim, since such miraculous scientific superiority was not an ordinary thing for a child of 9 years old. It is even mentioned that imam answered to about 30 thousand questions and problems in only a few days.
After the martyrdom of Imam Reza AS by Mamun, since Iranians felt hostile towards him, he moved backed from Toos to Bagdad, and to sort out this scandal, he welcomed Imam Taghi and respected him and even got him married to his own daughter, Ome Fazl.
It is said that Imam Taghi AS did not love her and was made to marry her by Mamun's force, and Ome Fazl was jealous of him, because she could not receive the kind of attention she had expected and found Imam Taghi AS indifferent to her. Therefore, when Mamun died in the year 218 hijri, and his brother, Motasam became the new caliph, Ome Fazl cooperated with her uncle in the assassination and murder of Imam Taghi AS. After Motasam became the new caliph, he summoned Imam and his wife, Ome fazl, from Medina to Baqdad. Imam who knew about Motasam's intentions, informed his Shia friends, and followers in Medina about the Imamat of his son, Imam Ali Naghi AS, and gave his will and the necessary instructions to Imam Ali Naghi AS, about the things he should be doing after his death, and left for Baqdad.
Ome Fazl poisoned Imam and killed him by the order of Motasam by the end of 220 hijri (835 Gregorian calendar), when Imam was only 25 years old. She herself was inflicted with leprosy in her genitals not long after her treasonous plot, and the doctors could not treat her despite all that she spent for her treatment, and she died of the disease.