Ronan of Locronan was an Irish bishop and hermit who traveled to western Brittany during the sixth century. Seeking a more ascetic life, he left his home in Ireland to establish a hermitage in the region of Léon. He eventually founded the settlement of Locronan, which bears his name. After facing various challenges and accusations from a local woman, he relocated to Domnonia, where he died near Hillion. He is recognized as a co-patron of Quimper and is commemorated as a saint in the Catholic tradition.