Nostradamus never made predictions that can be realistically assessed for accuracy (for more on making predictions that can be assessed against actual events I recommend the work of Philip Tetlock and in particular his book Superforecasting). His quatrains are vague and flowery which makes them similar to horoscopes or the Myers-Briggs test - easy to assign to past events (or people) but lacking any sort of predictive power. Many of his quatrains are essentially gibberish that require some fairly tenuous connections for them to be linked to historical events. This doesn't stop many folk from using them to point to some sort of apocalypse that is always just around the corner, but never happens.

Suffice it to say, historians don't take Nostradamus seriously.