Viscounty of Léon

The Viscounty or County of Léon (Breton: Kontelezh Leon) was a feudal state in extreme western Brittany in the High Middle Ages.

Though nominally a vassal of the sovereign duke of Brittany, Léon was functionally independent of any external controls until the viscounts came under attack by King Henry II of England.

In 1235 the subvassals of Léon and Penthièvre brought a series of complaints, the Communes petitiones Britonum, against the duke, Peter of Dreux, to King Louis IX of France.

[2] The right of wreck alone yielded 100,000 solidi per annum in revenues from a single rock on the treacherous coast, which an earlier viscount, Guihomar IV, had called his "most precious stone."

One place within the former viscounty that continues to preserve many examples of medieval architecture, such as the church of Notre Dame du Kreisker, is the town of Saint-Pol-de-Léon.