Ibn al-Rawandi dating history

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Abu al-Hasan Ahmad ibn Yahya ibn Ishaq al-Rawandi (Arabic: أبو الحسن أحمد بن يحيى بن إسحاق الراوندي‎), commonly known as Ibn al-Rawandi (Arabic: ابن الراوندي‎;‎ 827–911 CE), was an early Persian scholar and theologian. In his early days, he was a Mu'tazilite scholar, but then rejected the Mu'tazilite doctrine. Afterwards, he became a Shia scholar; there is some debate about whether he stayed a Shia until his death or became a skeptic, though most sources confirm his eventual rejection of all religion and becoming an atheist. Although none of his works have survived, his opinions had been preserved through his critics and the surviving books that answered him. His book with the most preserved fragments (through an Ismaili book refuting Al-Rawandi's ideology) is the Kitab al-Zumurrud (The Book of the Emerald).