Question: Which character on the HBO fantasy television series "Game of Thrones" is also prominent in author George R.R. Martin's series, "A Song of Ice and Fire?" 

Context articles: Rebels, Rogues &amp; Sworn Brothers
Songs the Dead Men Sing
Sophie Turner
Marie Antoinette syndrome
Michael Komarck
Songs of Stars and Shadows
Quartet (short story collection)
Sansa Stark
Languages of A Song of Ice and Fire
Portraits of His Children

Rebels, Rogues & Sworn Brothers is an album by punk/alt-country band Lucero.
 It was released in 2006.
 The album features less country influence than any previous release.
 It was the band's last album for an independent label before signing with Universal Music Group in 2008.
 The name of the album comes from the appendix of Storm of Swords, the third book in George R.R. Martin's Song of Ice and Fire series.
Songs the Dead Men Sing is the fourth short story collection of author George R.R. Martin.
 It was first published in October 1983 by Dark Harvest.
 It contains nine short stories.
Sophie Turner (born 21 February 1996) is an English actress.
 Turner made her professional acting debut as Sansa Stark on the HBO fantasy television series "Game of Thrones" (2011–present), which brought her international recognition.
Marie Antoinette syndrome is a sudden whitening of the hair.
 The event that named the syndrome was the observation that the hair of Queen Marie Antoinette of France turned stark white after her capture following the ill-fated Flight to Varennes during the French Revolution.
 Witnesses have alleged that Antoinette's hair suddenly turned white on three separate occasions.
 In the novel 'One hundred and One Dalmatians', by Dodie Smith, after the Dalmatians destroy Cruella de Vil's stock of furs, the shock renders her black hair white (and her white hair green).
 In Victor Hugo's novel 'Les Miserables' Jean Val-Jean's hair also goes pure white after the trauma of appearing in court in Arras.
 Other examples can be found in George R.R. Martin's "A Song of Ice and Fire" series, where the character Theon Greyjoy's hair turns white and brittle from extended brutal torture.
Michael Komarck is a fantasy artist.
 His work has been featured in many roleplaying games, board games, book covers, and collectible cards.
 Komarck produced the official art and calendars for George R.R. Martin's "A Song of Ice and Fire".
Songs of Stars and Shadows is the second short story collection by author George R.R. Martin.
 The collection was first published by Pocket Books on July 1, 1977 and contains nine short stories.
Quartet: Four Tales from the Crossroads is the seventh collection by author George R.R. Martin, first published in February 2001 by NESFA Press.
 It contains three novellas and a teleplay.
Sansa Stark is a fictional character created by American author George R. R. Martin.
 She is a prominent character in Martin's award-winning "A Song of Ice and Fire" series.
Several fictitious languages are mentioned in George R.R. Martin's fantasy series "A Song of Ice and Fire".
 These include:
Portraits of His Children is the sixth short story collection by author George R.R. Martin.
 The collection was first published in July 1987 by Dark Harvest.
 It contains 11 short stories.