The Citadel is an archive of information for George R.R. Martin's A Song of Ice and Fire.
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"Melisandre has gazed into the flames, and seen him dead."
This is Lady Selyse, Stannis's wife, speaking about Renly. Although relayed second-hand, it appears to support the idea that Melisandre has the ability to see future events through scrying in fire.
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