One of the most common practices through the middle Ages for dealing with religious conquest was the idea of outwardly practising the conqueror's faith while privately remaining loyal to the faith of one's fathers. This was of course most clearly seen after the reconquista in Spain where people became Crypto-Muslims and Crypto-Jews, openly asserting that they had converted to Catholicism, when in actual fact they were still practising their old faith in secret.
I think this could make a nice little feature, given the proliferation of Holy Wars, Jihads and Crusades in the game. The Crypto could then maintain good relations with their new liege and with their vassals, performing regular acts of charity etc to their old religion or maintaining religious holdings of the former religion, to affirm that they are still privately committed. You could then have other options such as being found out and tried for apostasy/heresy, or secretly organising a religious uprising/rebellion.
It would also make things more realistic if after a jihad or holy war, the vassals of the target province were given the option to convert or lose their lands. Perhaps it would make sense in such a scenario that players with high intrigue and high piety could also be given the option to become crypto.
I think this could make a nice little feature, given the proliferation of Holy Wars, Jihads and Crusades in the game. The Crypto could then maintain good relations with their new liege and with their vassals, performing regular acts of charity etc to their old religion or maintaining religious holdings of the former religion, to affirm that they are still privately committed. You could then have other options such as being found out and tried for apostasy/heresy, or secretly organising a religious uprising/rebellion.
It would also make things more realistic if after a jihad or holy war, the vassals of the target province were given the option to convert or lose their lands. Perhaps it would make sense in such a scenario that players with high intrigue and high piety could also be given the option to become crypto.
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