Something that did happen in 622 exactly or at whatever date before 632 ? I cannot see the second option because that calendar is really tying up to 622. I am re-reading De Premarre but , so far, nothing has caught my eye. I guess this is not the Omar trip to the Ghassan after the Yarmouk victory you are referring to ?
The topic was about hijra/ the year of the ArabsI said :
It can be a political event. R. Kerr has noted that it could be the starting of the counter attack of Heraclius in April 622. An interesting option.
But I think to another option, which is only known by Muslim sources. Not interpreted in the way they interpreted it. An event before 632, of course.
Nope this is not the Omar trip.
Something that happened between 602 and 632 (the "death" of the "prophet").
It is perfectly normal that nothing has caught your eye as de Prémare is of course a believer of the existence " of the "prophet" (even if he tries to understand and is suspicious). From the moment you continue to believe to this, you are hypnotised. When you
get rid of it you read more
carefully all the information he gives and things which could fit to an
event representing the year of the Arabs (as it is called in Muawiya inscription) which has nothing to do with a "prophet"/Zem Zem and the rest...
I'm sure you can find it.