Right, so now Nostradamus is predicting a 'terror from the sky', which in his time could easily have been interpereted as a storm, eclipse, comet, meteor or any manner of U.F.O., and in our time can be air disasters as well. Since 'King' in this sense need not be a physical person, it can be any major disaster...or even an omen thereof. Not only does this mean that there is no way of pinning him down on a date, the metaphorical nature of his 'prophesies' means that they can be interepereted nearly any way.
'Good old Nostradamus...he always new there would be an east from west, and somewhere in between, someone would be fighting'
'...but the truth of all predictions is always in your hands...'