" One of its texts was a book supposedly painted in a cave and present in a library at Ghazni as late as the eleventh century; that text was the (*) Arzhang.
According to one of this religion's texts, its founder had a mysterious twin who revealed a secret revelation at the age of twenty-five. The phrase "on the origin of his body" titled that text, which is known to modern scholars as the "Cologne Codex." Albert von le Coq's German Turfan expedition uncovered paintings by followers of this religion, as well as some of their texts, which used a writing system called the "Estrangelo." One of its texts was a book supposedly painted in a cave and present in a library at Ghazni as late as the eleventh century; that text was the (*) Arzhang. Mou-Yu made this religion the official belief of the Uighurs, though it was prohibited in Tang China. Divided between the devout "Elect" and the less-devoted "Hearers," this religion holds that a primordial "World of Light" preceded creation. For 10 points, a third-century CE Persian prophet founded what religion, whose name still indicates a system of dualistic extremes?
According to one of this religion's texts, its founder had a mysterious twin who revealed a secret revelation at the age of twenty-five.
Manichaeism [or Manichaenism; accept word forms]