<P> Martin is widely credited with broadening the fantasy fiction genre for adult content, including incest, paedophilia, and adultery . For The Washington Post's Writing for The Atlantic, Amber Taylor assessed the novels as hard fantasy with vulnerable characters to which readers become emotionally attached . CNN found in 2000 that Martin's mature descriptions were "far more frank than those found in the works of other fantasy authors", although Martin assessed the fantasy genre to have become rougher - edged a decade later and that some writers' work was going beyond the mature themes of his novels . Adam Roberts called Martin's series the most successful and popular example of the emerging subgenre of grimdark fantasy, influencing other writers associated with that style, such as Joe Abercrombie . </P> <P> Setting out to write something on an epic scale, Martin projected to write three books of 800 manuscript pages in the very early stages of the series . His original 1990s contract specified one - year deadlines for his previous literary works, but Martin only realized later that his new books were longer and hence required more writing time . In 2000, Martin planned to take 18 months to two years for each volume and projected the last of the planned six books to be released five or six years later . However, with A Song of Ice and Fire series evolving into the biggest and most ambitious story he has ever attempted writing, he still has two more books to write as of 2018 . Martin said he needed to be in his own office in Santa Fe, New Mexico to immerse himself in the fictional world and write . As of 2011, Martin was still typing his fiction on a DOS computer with WordStar 4.0 software . He begins each day at 10 am with rewriting and polishing the previous day's work, and may write all day or struggle to write anything . Excised material and previous old versions are saved to be possibly re-inserted at a later time . Martin does not consider A Song of Ice and Fire a "series" but a single story published in several volumes . </P> <P> Martin set the A Song of Ice and Fire story in a secondary world inspired by Tolkien's writing . Unlike Tolkien, who created entire languages, mythologies, and histories for Middle - earth long before writing The Lord of the Rings, Martin usually starts with a rough sketch of an imaginary world that he improvises into a workable fictional setting along the way . He described his writing as coming from a subconscious level in "almost a daydreaming process", and his stories, which have a mythic rather than a scientific core, draw from emotion instead of rationality . Martin employs maps and a cast list topping 60 pages in the fourth volume, but keeps most information in his mind . His imagined backstory remains subject to change until published, and only the novels count as canon . Martin does not intend to publish his private notes after the series is finished . </P> <P> Martin drew much inspiration from actual history for the series, having several bookcases filled with medieval history for research and visiting historic European landmarks . For an American who speaks only English, the history of England proved the easiest source of medieval history for him, giving the series a British rather than a German or Spanish historic flavor . For example, Ned and Robb Stark resemble Richard, 3rd Duke of York and his son Edward IV, and Queen Cersei resembles both Margaret of Anjou and Elizabeth Woodville . Martin immersed himself in many diverse medieval topics such as clothing, food, feasting, and tournaments, to have the facts at hand if needed during writing . The series was in particular influenced by the Hundred Years' War, the Crusades, the Albigensian Crusade, and the Wars of the Roses, although Martin refrained from making any direct adaptations . Martin was also inspired by the French historical novels The Accursed Kings by Maurice Druon, which are about the French monarchy in the 13th and 14th centuries . </P>

A song of ice and fire reading sequence