I dunno when the mongals turn up but the timurids turn up in 1370 with the faction leader and prince first (for me it was around baghdad). Then two 8 star generals and two 10 star generals with ten dread turn up in the same sort of place in the second wave. And the third waves in the same place but its only two 8 star gens and two 6 star gens well in my campaign it was anyway.