Disambiguation evidence for Joan of Penthièvre, Duchess of Brittany via surface form

"Joan of Penthièvre, Duchess of Brittany"

Triples (1)

Triples where some other subject referred to this entity as "Joan of Penthièvre, Duchess of Brittany".

John III of Penthièvre → grandmother →
"Joan of Penthièvre, Duchess of Brittany"
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