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.
[NOTE: This is from private correspondence without the usual header information we use to verify. However, a screenshot of the message can be seen here, with the name of the respondee redacted.]
Who would win in a fight, Barristan Selmy or Arthur Dayne (in their best days)?
Dayne... if he was armed with Dawn.
If both men had equivalent weaponry, it might be a toss-up.
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.