Boar's Hill (or Boars Hill) is a small hillside village situated about 3 miles southwest of Oxford. It is renowned for its particularly fine views of the surrounding countryside.
It is connected with a number of literary figures, including Matthew Arnold (for whom it provided the setting and inspiration for two poems: The Scholar Gypsy and Thyrsis), Robert Bridges, Robert Graves, Edmund Blunden and John Masefield, all of whom lived there are at various times.
It is not entirely clear why cousin Jasper should warn Charles against Boars Hill. Does anybody have any suggestions?