William Morris 
The Well at the World’s End [EPUB ebook] 

Using language with elements of the medieval tales which were his models, Morris tells the story of Peter, King of Upmeads, and his four sons, Blaise, Hugh, Gregory, and Ralph. These four sons decide one day that they would like to explore the world, so their father gives them permission, except for Ralph, who is to remain at home to ensure at least one living heir.