The Citadel is an archive of information for George R.R. Martin's A Song of Ice and Fire.
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Is it true that you based A Song of Ice and Fire off the War of Roses?
No, not really. Certainly I wanted to give my series a strong grounding in real medieval history, rather than in other fantasy novels, but I drew on a whole number of sources and periods. The Wars of the Roses, yes, but also the Hundred Years War, the Crusades, the Norman Conquest... you name it.
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.