As part of his contribution to The World of Ice and Fire, George R. R. Martin created an extensive history of House Targaryen from Aegon I through to the early reign of Aegon III. This material was so substantial that only heavily paraphrased or redacted forms were used in the actual book. These may see later publication—alongside further Targaryen material—in Fire and Blood, also sometimes jokingly called the GRRMarillion. There is no prospective publication date for this work, as it remains speculative, but Martin suggests it would be a project for after he completes A Song of Ice and Fire.