Question: David Gwillim is known for playing Prince Hal in a series of British television adaptations of plays created by who?

Context articles: Mapp and Lucia
Six Days of Justice
Henry IV, Part I and Part II (film series)
Posy Fossil
BBC Television Shakespeare
David Gwillim
Richard II (2012 film)
The 39 Steps (2008 film)
Colleen Dewhurst
The Naval Treaty

Mapp and Lucia is a collective name for a series of novels by E. F. Benson, and also the name for two British television adaptations based on those novels.
Six Days of Justice is a British television drama anthology series of single plays created by Thames Television and shown on ITV from 1972 to 1975, over four seasons of six episodes apiece.
Henry IV, Part I and Henry IV, Part II are 2012 British television films based on the plays of the same name by William Shakespeare.
 They are the second and third films in the series of television films called "The Hollow Crown" produced by Sam Mendes for BBC Two covering the second set of plays in Shakespeare's Henriad.
 They were directed and adapted by Richard Eyre and star Jeremy Irons as King Henry IV, Simon Russell Beale as Falstaff and Tom Hiddleston as Prince Hal.
 Much of the two films' cast and crew overlap and the plot flows directly from the first to the second.
Posy Fossil is a character in the book "Ballet Shoes" and its two television adaptations.
 She was adopted by Professor Matthew Brown, called "Gum", who took her from her mother, the dancer.
 She is portrayed by Sarah Prince (in 1975 adaption) and by Lucy Boynton (in 2007 adaptation).
 She was created by Noel Streatfeild in 1936.
The BBC Television Shakespeare is a series of British television adaptations of the plays of William Shakespeare, created by Cedric Messina and broadcast by BBC Television.
 Transmitted in the UK from 3 December 1978 to 27 April 1985, the series spanned seven seasons and thirty-seven episodes.
David Gwillim (born 15 December 1948) is an English actor, known for playing Prince Hal in the "BBC Television Shakespeare" adaptations of "Henry IV, Part I" and "Henry IV, Part II" and the title role in "Henry V" which were broadcast in 1979, and as John Bold in "The Barchester Chronicles" broadcast in 1982.
Richard II is a 2012 British television film based on William Shakespeare's play of the same name.
 It is the first of four television adaptations of Shakespeare's second history tetralogy commissioned by BBC Two under the series title "The Hollow Crown".
 "Richard II" was directed by Rupert Goold, who adapted the screenplay with Ben Power.
 Ben Whishaw stars as the titular Richard II of England.
 It was first broadcast on 30 June 2012 on BBC2.
The 39 Steps is a 2008 British television adventure thriller feature-length adaptation of the John Buchan novel "The Thirty-Nine Steps" produced by the BBC.
 It was written by Lizzie Mickery, directed by James Hawes, and filmed on location in Scotland, starring Rupert Penry-Jones, Lydia Leonard, David Haig, Eddie Marsan, and Patrick Malahide.
 Following three screen versions of the novel and the 1952 and 1977 television adaptations of "The Three Hostages", Penry-Jones became the sixth actor to portray Hannay on screen.
 This adaptation is set on the eve of the First World War and sees mining engineer Richard Hannay caught up in an espionage conspiracy following the death of a British spy in his flat.
Colleen Rose Dewhurst (June 3, 1924 – August 22, 1991) was a Canadian-American actress known most for theatre roles, and for a while as "the Queen of off-Broadway."
 In her autobiography, Dewhurst wrote: "I had moved so quickly from one off-Broadway production to the next that I was known, at one point, as the 'Queen of off-Broadway'.
 This title was not due to my brilliance but rather because most of the plays I was in closed after a run of anywhere from one night to two weeks.
 I would then move immediately into another."
 She was a renowned interpreter of the works of Eugene O'Neill on the stage, and her career also encompassed film, early dramas on live television, and Joseph Papp's New York Shakespeare Festival.
 One of her last roles was playing Marilla Cuthbert in the Kevin Sullivan television adaptations of the "Anne of Green Gables" series and her reprisal of the role in the subsequent TV series "Road to Avonlea" (marketed as "Avonlea" in the US).
"The Naval Treaty" is an episode of the Sherlock Holmes television adaptations of the Sir Arthur Conan Doyle stories, produced by British television company Granada Television between 1984 and 1994, starring Jeremy Brett as the famous detective.
 It was the third of seven episodes aired in the series' first season, called "The Adventures of Sherlock Holmes".
 The episode first aired on 8 May 1984.