I (King of Lenister) was looking over my vassals and saw that my niece (Countess of Lenister) had the modifier "Closed Gates of Hell", which gives her a +5 Learning, +5 Church Vassal Opinion, and +3 General Opinion. Was very confused, so I looked it up here. Would seem that my brother's otherwise rather innocuous daughter stepped up when the universe presented her the opportunity.
God was bound to throw her a bone eventually, what with me covertly assassinating her husband and three children to keep the county from passing to the Kingdom of Wales when she dies and all.