"National Anthem of the Ancient Britons", also known as "Woad" or "The Woad Ode", is a humorous song, set to the tune of "Men of Harlech". It first became popular in the 1920s as a song in the British Boy Scouts and appeared in The Hackney Scout Song Book (Stacy & Son Ltd, 1921). The author was William Hope-Jones, a housemaster at Eton, who wrote it some time before 1914, as he sang it at a College dinner at that time. "Ho Jo" appears in the M. R. James' ghost story Wailing Well (1928), in which a group of masters take the Eton Scout Troop on an ill-fated camping expedition. The song recounts the ancient British tradition of fighting naked, dyed with woad. It has also been known as "The Woad Song" and "Woad of Harlech".