[duskwuff]

It's still a little ambiguous - and perhaps deliberately so - whether Leto is describing what inspired the Jihad, or what it became. The series makes it quite clear that the two are often not the same. As Leto continues later in that chapter:

"Throughout our history, the most potent use of words has been to round out some transcendental event, giving that event a place in the accepted chronicles, explaining the event in such a way that ever afterward we can use those words and say: 'This is what it meant.' That's how events get lost in history."