Ouch, that must have hurt. And I thought I had it bad with my civil war in the HRE, but in the end I only lost Livland and the neighbouring province. Plus, it seems to me, civil war broke out in all neighbour nations, the English (owning most of France) and the French (owning most of England ) lost a considerable amount of territory to rebellions as well. Good for me, now that I´ve cleaned up the rebellion I can snatch new territories without anyone screming murder about it