Philip II of France formally absorbed the Duchy of Brittany into the French royal orbit following the death of Arthur I in 1203, and these deniers were struck during the contested years when French administrative control was being consolidated over a duchy that had previously looked toward the Plantagenets. Arthur's disappearance — almost certainly murdered on Philip's orders — ended Angevin claims to Brittany and left the duchy without a functioning native duke, creating the administrative vacuum under which this coinage was produced.
Philip II of France formally absorbed the Duchy of Brittany into the French royal orbit following the death of Arthur I in 1203, and these deniers were struck during the contested years when French administrative control was being consolidated over a duchy that had previously looked toward the Plantagenets. Arthur's disappearance — almost certainly murdered on Philip's orders — ended Angevin claims to Brittany and left the duchy without a functioning native duke, creating the administrative vacuum under which this coinage was produced.