Located in the city of Matsuyama on the island of Shikoku, Dogo Onsen is considered to be one of the oldest, if not the oldest onsen in Japan. There are references to Dogo Onsen in documents from the 8th century. It is reported Prince Shotoku (considered to be the father of Japanese Buddhism) enjoyed the baths, and the baths are mentioned in the “Tales of Genji” written about 1,000 years ago. According to the legends, long ago many egrets lived in Dogo. One day, an egret who injured his leg was seen soaking its leg every day in the hot water. Eventually the egret became well and flew away. The people who saw this began to use the hot springs and their health improved. The news spread that the hot spring was beneficial for ones health, and the hot spring became popular.