Tito...

If you refuse them passage they automatically attack, or retreat, and Papa excomms you.

In the Diplomacy area it shows you are now at war with them. No one is blockading me as they have no ships at all.... stupid Frogs. I've been at war with both France and Spain this way and the same thing occured.

Conversely, I attacked Byz and in their waters it states that it is blockaded.

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O stranger, Go tell the Spartans that we lie here, obedient to their will.....