Is this supposed to happen? Why would conquering a duchy in war via claim work differently than usurping the title (if a count usurps a duchy and you are king they stay your vassal normally)?

  • It might be different if the duchy isn't a de jure part of your kingdom (I take it that you are a king and their direct liege). Was the duchy independent before the war? Or a part of a different Kingdom or Empire? – Dacio Oct 27 '15 at 15:12

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