I can´t recall re-emergences with more than about three provinces per faction. Once, however, I remember that the demise of Hungary (me playing the HRE) led to the re-emergence of three different factions with two to three provinces each.
That´s what I love about MTW, factions that are destroyed aren´t gone for good but may come back, and huge empires can crumple to dust within short time, often leading to other factions coming back.
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