There are various theories regarding the origin of the custom of eating eel on the Ox day during the summer doyo, but the best known of them is that the idea was devised by Gennai HIRAGA, who came from Sanuki Province.
鰻を食べる習慣についての由来には諸説あり、讃岐国出身の平賀源内が発案したという説が最もよく知られている。