The term "Poutrocoët" is Breton, and contemporaries translated it literally into Latin as pagus trans silvam, the "country beyond the forest", as in certain charters in the cartulary of Redon Abbey.
[1][2][a] Poutrocoët was originally a part of the early Breton kingdom of Domnonée, and included a smaller region carrying the name Porhoët.
[1][3][b] It was sparsely populated and heavily forested, and so is sometimes associated with Brocéliande and the Argoat.
In the 860s they began to be styled "Bishops of the see of Saint Malo" (episcopus super episcopatum sancti Machutis).
"Les anciennes structures rurales de Bretagne d'après le cartulaire de Redon: Le paysage rural et son évolution".