== Origins and sources == 

 This section has been "rationalised" - basically by removing everything about possible "Persian" origins, on the grounds that the references given did not check out. I have assumed good faith here (specifically that the editor concerned has actually looked at the original sources behind the references before rejecting them!) - but the stump of what was left no longer made sense - so I have copy edited the section a bit. It remains incomplete - if someone can find a (legitimately) referenced statement about the original Arabic manuscripts or editions this would round out the section.