In February 2017 , Elio M. García Jr. , Martin 's co-author for '' The World of Ice & Fire '' , reported that he had spoken with Martin at WorldCon 75 , held in 2017 in Helsinki , about the first volume of '' Fire & Blood '' . According to García , in addition to the never-published material developed for '' The World of Ice & Fire '' , Martin also created entirely new material for the book , having " worked some on just fleshing out a bit " the long reign of King Jaehaerys I Targaryen , which was previously only mentioned in " Heirs of the Dragon " , an unpublished text that Martin abridged in the novelette The Rogue Prince
WorldCon 75
75th World Science Fiction Convention
Fire & Blood (book)