Question: Who was born first, Guy Gavriel Kay or Joanne Harris?

Context articles: The Darkest Road
The Summer Tree
Under Heaven (novel)
Joanne Harris
The Fionavar Tapestry
Susan Allison
Ysabel
Guy Gavriel Kay
The Wandering Fire
River of Stars

The Darkest Road is the third novel of The Fionavar Tapestry trilogy by Guy Gavriel Kay. "
The Summer Tree" and "The Wandering Fire" are the first two books.
The Summer Tree (1984) is the first novel of The Fionavar Tapestry trilogy by Guy Gavriel Kay.
Under Heaven is the eleventh novel by Canadian fantasy author Guy Gavriel Kay.
 It was published in April 2010 by Viking Canada.
 Set in a fantasied Tang China, it is Kay's first work set outside of a fantasied European or Mediterranean setting.
 The novel is based on a fictionalized version of the An Shi Rebellion.
 "Under Heaven" takes place in a completely new world, as seen by it having only one moon as opposed to the two moons normally present in Guy Gavriel Kay's works.
 In 2013 he published a second novel, "River of Stars", set approximately 400 years later in the same world.
Joanne Michèle Sylvie Harris, {'1': ", '2': ", '3': ", '4': "} (born 3 July 1964) is an English author, known for her award-winning novel "Chocolat".
 It was later turned into the 2000 film "Chocolat".
The Fionavar Tapestry is a trilogy of fantasy novels by Guy Gavriel Kay, first published between 1984 and 1986.
 The novels are partly set in our own contemporary world, but mostly in the fictional world of Fionavar.
 It is the story of five University of Toronto senior law and medical students, who are drawn into the 'first world of the Tapestry' by the mage Loren Silvercloak.
 Once there, each discovers his or her own role and destiny in the framework of an epic conflict.
 The books original cover illustrations were created by Martin Springett.
Susan Allison is an editor-in-chief and vice president at the Ace Books and Berkley Books imprints, which are part of the Penguin Group (USA) publishing company.
 In 1984 she published William Gibson’s first novel, Neuromancer, and Guy Gavriel Kay’s first novel, The Summer Tree.
 Both of these authors are still edited by her, now for Penguin Random House.
 Her authors also include bestselling author Laurell K. Hamilton and southern eminence Lee Smith.
 She became editor-in-chief in 1982, and was made a vice-president in 1985.
 She was a guest of honor of the 1990 World Fantasy Convention.
Ysabel is the tenth novel by Canadian fantasy author Guy Gavriel Kay.
 It was first published in January 2007 by Viking Canada.
 It is Kay's first urban fantasy and his first book set outside his fantasied Europe milieux since the publication of his first three novels in the 1980s ("The Fionavar Tapestry").
 Kay lived in the countryside near Aix-en-Provence, the setting of Ysabel, while he wrote it.
 The story tells of 15-year-old Ned Marriner who discovers his magical heritage while staying with his photographer father in Provence.
 He meets an American exchange student, the two become involved in an ancient "story" of love, sacrifice, and magic unfolding in the present day, which draws in Ned's family and friends.
Guy Gavriel Kay {'1': ", '2': ", '3': ", '4': "} (born November 7, 1954) is a Canadian writer of fantasy fiction.
 Many of his novels are set in fictional realms that resemble real places during real historical periods, such as Constantinople during the reign of Justinian I or Spain during the time of El Cid.
 Those works are published and marketed as historical fantasy, although Kay has expressed a preference to avoid genre categorization.
The Wandering Fire is the second novel of The Fionavar Tapestry trilogy by Guy Gavriel Kay. "
The Summer Tree" is the first.
River of Stars is the twelfth novel by Canadian fantasy author Guy Gavriel Kay.
 It was published in April 2013 by Roc Hardcover.
 It is Kay's second work set in an alternate history of China, taking place 400 years after his previous novel, "Under Heaven".
 The novel is a fictionalized account of the beginning of the Jin–Song Wars during the Song Dynasty.