I just created a proposal page to tag citadels: https://wiki.openstreetmap.org/wiki/Proposed_features/Citadel The proposed tag is castle_type=citadel.
All feedback is welcome. Feel free to share it here, but I prefer to discuss the proposal on the Community Forum and on the discussion page on the Wiki. https://community.openstreetmap.org/t/rfc-proposal-to-tag-citadels/3570
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