Professor Giles Macfarlane is a character from The Lost Stories.
He appears in the prologue and epilogue of The Lost Stories, a professor in charge of an archeological dig by the remains of Castle Redmont, now called Redmanland.
There, one of the younger diggers on the site, Audrey, comes across the remains of an old log cabin. She leads the Professor to it and there they find a chest containing a book, which contains The Lost Stories.
The Professor then proceeds to read the stories written down on the parchment. The Book was written by either Will or Halt.(Aka John Flanagan)