The Arzhang (Aržang - a Parthian word meaning "Worthy") was one of the holy books of the Manichaean religion, written and illustrated by its prophet Mani, in Syriac Aramaic. It was unique in that it contained numerous pictures designed to portray the events in the Manichaean description of the creation and history of the world.
The book has been lost and its content is unknown. However, it is known that its illustrations were of appreciable quality, and copies were preserved in the Middle East as late as 1092 AD, when it is recorded that the library of Ghazni held a copy.