Denier - Conan III

Conan III ruled Brittany through a period of persistent friction with the Angevin counts and the English crown — his father Alain IV had abdicated under pressure, and Conan spent much of his reign defending ducal authority against both external encroachment and internal baronial resistance. These deniers were struck at a weight standard already in decline, the silver content of Breton billon coinage having eroded steadily since the late eleventh century as the duchy's mints struggled to maintain consistency without centralized monetary control.

The Jezézéquel references 22–24 distinguish at least three die varieties within this type.