The Citadel is an archive of information for George R.R. Martin's A Song of Ice and Fire.
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I am not completely certain how long a period of time A SONG OF ICE AND FIRE will cover. There will be a gap of about five or year between the end of A STORM OF SWORDS and the beginning of A DANCE WITH DRAGONS, but overall... well, we'll have to wait and see.
"The Hedge Knight" is set about a century before A SONG OF ICE AND FIRE.
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