The World of Ice & Fire: The Untold History of Westeros and the Game of Thrones is a companion book for George R. R. Martin's A Song of Ice and Fire fantasy series. Written by Martin, Elio M. García Jr. and Linda Antonsson, it was published by Bantam on October 28, 2014. The 326-page volume is a fully illustrated "history compendium" of Martin's fictional world, written from the perspective of an in-world "Maester" and featuring newly written material, family trees, and extensive maps and artwork. Source: Wikipedia (en)