A Knight of the Seven Kingdoms is a collection of the first three ‘Dunk & Egg’ novellas, described below. The American edition, published October 6th 2015, is lavishly illustrated by Gary Gianni.
"The Hedge Knight" is a ‘Dunk & Egg’ novella originally published in Legends, an anthology edited by Robert Silverberg which contains original short stories and novellas from major fantasy authors in their various famous settings. GRRM’s contribution takes place around the year 209 during the reign of Daeron II, and has no apparent direct bearing on the novels. It’s also available in Dreamsongs II, a collection of Martin’s short fiction that we very highly recommend—besides “The Hedge Knight”, it contains a number of his award-winning short science fiction and horror stories.
"The Sworn Sword" is a ‘Dunk & Egg’ novella originally published in Legends II, a follow-up to the original Legends anthology. Like the first one, this one is also edited by Robert Silverberg and contains original short stories and novellas from major fantasy authors in their various famous settings. GRRM’s contribution takes place some time after the end of "The Hedge Knight", and it too has no apparent direct bearing on the novels.
"The Mystery Knight" is a ‘Dunk & Egg’ novella originally published in the Warriors anthology, released in March 2010.