The author of When William Came was Edwardian. The author of Green, Green My Valley Now was also Edwardian.
Richard Dafydd Vivian Llewellyn Lloyd (8 December 1906  30 November 1983), known by his pen name Richard Llewellyn, was a British novelist. 
Hector Hugh Munro (18 December 1870  14 November 1916), better known by the pen name Saki, and also frequently as H. H. Munro, was a British writer whose witty, mischievous and sometimes macabre stories satirize Edwardian society and culture. 
Green, Green My Valley Now is a 1975 novel by Richard Llewellyn. 
When William Came: A Story of London Under the Hohenzollerns is a novel written by the British author Saki (the pseudonym of Hector Hugh Munro) and published in November 1913. 
