60 years in France.

[Ironside]

The rebellion took place over three turns.

On the first turn, the Northern waters were blockaded, Iberia turned red, however I fixed this so that only two were on 98% loyalty. I survived this turn.
The next turn, the Northern waters were open excepting the North sea, and Iberia was 33% red, and all of aforementioned France was irretrievably red.
That is to say, even with very low taxes and reasonable garrisons, the loyalty ranged from 0 - 27%.
Because of this, when France re-emerged on the next turn, all of Iberia was red.
This meant that Castile, Portucale and Aragon were all returning.

Perhaps this would have been easily fixed had I not been at war with the second largest military in Europe!

Oh yes, and the King was in Wessex at this time because the elder had died, his old brother had taken the throne, then died two years later, and the nephew (Thank god) took over.

This is no doubt attributive.

Did you use the v button (I think that's the key) to see the intact sea lines? Because the channel line seems to be broken, perhaps from another faction than Denmark. Ship contact to Spain but streching by land through France was too much.

Anyway, I am interested in the loyalty drop once I reach the 50 per cent of the map. How many per cent is it? I still rely on sea to link my domain between Iberia and the other lands (there is only 1 neutral ship in the Med and it is full with my ships ) Basically, only Aragon, Switzerland and Burgundy can potentially re-emerge but this can also be a problem for me. I am also worried about my income. Large part of it comes from trade and now there is only Spain (5 provinces: Portugal, Tolouse, Aquitane, Algeria and Tunisia) to trade with me. My cash is about 82 000, though they have been 110 000 ten years ago, though officially there is still surplus. But once my trade partner disappears, I do not know...

Once I counquer Anjou, I should also fear of English re-emergence but these never re-emerged since their disappearance about 1150, even earlier, I think. This was so even when the provinces was held by rebels.

Btw, I should go for 60 per cent victory. The game has been too long.

P.S. I love spies. They already opened 4 castles and I got these provinces without any damages!

The loyalty drop is nothing more than that the "distance to king" factor is getting more important. For example Switzerland is usually getting unstable without spies simply because they're so far inland by province counting. That means that 3/4 of your empire might suddenly rebel because of one disrupting boat.
England should not come back, if they stayed dead for more than a generation the potential royal heirs should have died out. The game chooses royal heir that didn't had came to age when the faction was wiped out to lead the re-emergence, from what I understand.