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braunschweig1

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What are you going to do, execute all the relatives you've married? Breaking royal marriages is a STAB hit so if conversion broke the royal marriages without lowering STAB it would be very strong (and gamey) to just convert and backstab DoW someone.
 

GRWalker

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It's the same behavior as when you force convert by religious rebels. Alliances are broken but other relationships (royal marriages, guarantees etc) are kept as long as they are valid in the new religion as well.

It's not certain you'll be able to re-ally afterwards because same/different religion opinion modifier will have changed after conversion.
 

Sfan

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Alliances are always broken when you flip religion.