Hanbalite, who wrote no less than 500 works on Islamic law. He was a staunch proponent of Salafism, a Jihadi scholar and tutor to al-Jawziyya, and he vehemently opposed Greek philosophy and Christianity. He was what we’d now call a flaming revolutionary. He fought in the war against the Shiite Alawites and called Muslims to take arms against the Mongols. His intolerance and zeal landed him in a jail a fair few times, and that’s where he died. Ibn Taymiyya’s teachings are more present today than they were in his lifetime; they inspired al-Wahhab, the father of the Wahhabism that rules Saudi Arabia, and greatly influenced Osama bin Laden.