It works well unless the person with such a mark had their wife kidnapped and the only way to ensure she was no longer being tortured was to tell a lie and caus

It works well unless the person with such a mark had their wife kidnapped and the only way to ensure she was no longer being tortured was to tell a lie and cause an entire political dynasty to be wiped out. Well, unless lying once enabled double crossing and the heir to such a dynasty's escape was marked by the person with that mark.