The Citadel is an archive of information for George R.R. Martin's A Song of Ice and Fire.
New to the series? Read our spoiler-free review of A Game of Thrones.
At the San Diego signing, I asked GRRM at the Q&A, "Besides Dany's dragons, have all the Targaryen dragons been descendants of Aegon the Conquerors three?" GRRM answered "yes".
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.