Hop-Along Cassidy is a 1935 American western film, featuring the character "Hop-Along Cassidy" created by writer Clarence E. Mulford.
 This is the first of 66 "Hopalong Cassidy" films produced between 1935 and 1948 and all starring William Boyd in the title role.
 William Boyd was originally offered the role of Buck Peters, the ranch foreman, but decided to take the role of Hop-Along instead.
William Robertson Davies, CC, OOnt, FRSC, FRSL (28 August 1913 – 2 December 1995) was a Canadian novelist, playwright, critic, journalist, and professor.
 He was one of Canada's best known and most popular authors and one of its most distinguished "men of letters", a term Davies is variously said to have both gladly accepted for himself and to have detested.
 Davies was the founding Master of Massey College, a graduate residential college associated with the University of Toronto.
William Boyd, CBE (born 7 March 1952) is a Scottish novelist and screenwriter.
Gordon Roper was chair of English at Trinity College, a member of the graduate faculty at the university, a senior founder of Massey College and responsible as Senior Fellow Emeritus for developing the Massey College library, later renamed the Robertson Davies library.
 Northrop Frye and E. J. Pratt were his friends.
 Governor General Adrienne Clarkson was a former student.
Brenda Ethel Davies (née Mathews) (January 17, 1917 – January 9, 2013) was the wife of the Canadian novelist Robertson Davies.
Happy Alchemy, first published by McClelland and Stewart in 1997, is a collection of writings by Canadian novelist Robertson Davies.
 The collection was edited after Davies' death in 1995 by his literary executors: his wife Brenda and daughter Jennifer.
The Peterborough Examiner is a newspaper that services Peterborough, Ontario and area.
 The paper started circulation in 1847, and is currently owned by Postmedia.
 Between 1942 and 1955, it was edited by Canadian man of letters Robertson Davies, whose unique three-paragraph editorial style won several awards.
 Davies remained owner and publisher of the "Examiner" and Ralph Hancox the editor until 1967, when it was sold to the Thompson chain of newspapers.
 Subsequently, Sterling, Hollinger and Sun Media owned the newspaper before Post Media, the current owner.
 It is the only daily newspaper in Peterborough city and county.
 Its publisher is Darren Murphy and managing editor is Kennedy Gordon.
Fifth Business (1970) is a novel by Canadian writer Robertson Davies, who is also a playwright, critic, journalist, and professor.
 It is the first installment of the "Deptford Trilogy" and explores the life of the narrator, Dunstan Ramsay.
 It is Davies' best-known novel and has been ranked as his finest.
Armadillo was a 2001 two part television film starring James Frain, directed by Howard Davies and based on William Boyd's novel of the same name.
 Boyd also served as the screenwriter for the show.
Hoppy Serves a Writ is a 1943 Western film directed by George Archainbaud and starring William Boyd as Hopalong Cassidy.
 The supporting cast features Andy Clyde, Victor Jory and George Reeves.
 The film remains noteworthy today as one of the earliest performances (his 3rd) of unshaven newcomer Robert Mitchum, who made an impression upon the studio by generating a surprising fan mail response exactly as Clark Gable had after playing an extremely similar unshaven role in "The Painted Desert", a Western starring William Boyd produced a dozen years earlier.

Question: Do William Boyd and Robertson Davies have the same nationality ?
Answer: no