Aaron of Aleth was a 6th-century monk, hermit, and abbot who is believed to have traveled from Wales to Armorican Domnonia. After living as a solitary figure near Lamballe and Pleumeur-Gautier, he established himself on the island of Cézembre, located near Aleth. During his time on the island, he attracted numerous visitors, including Malo, who eventually succeeded him as the spiritual leader of the region. He is recognized as a saint within the Catholic tradition.