John I, Count of Penthièvre dating history

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This count of Penthièvre, our cousin, writes and names himself John of Brittany and carried the arms of Brittany, as if he were the heir. We want him to call himself John, because it is his name, and count of Penthièvre, but we do not want him to adopt the ermine or call himself John of Blois or of Châtillon or anything else. And if he does not do it, we will make him do it and will take from him his land, because he holds it in faith and homage for us; and also regarding the inheritance of Brittany, he should never make a thought that it will return to him, because we have sons and daughters who will be our heirs. If it goes elsewhere, it is because our line has ended.