IX. The Ninth Imam, Muhammad, known as al-Taqi (195/809-220/835)
The son of the eighth Imam, he was given the daughter of the caliph al-Ma'mun in marriage and for a time was kept by the caliph in Baghdad. But he was able to return to Medina until the end of al-Ma'mun's reign. The new caliph, al-Mu'tasim, summoned him back to Baghdad where he died. He is buried in Kazimayn in Iraq.