Game of Thrones is a site for the HBO-series based on George R.R. Martin's A Song of Ice and Fire.
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Tall, broad, loud, and with a red beard, Mero is captain of the Second Sons, a company of sellswords who have a long history but have earned a bloody reputation under his command. He is loud, boisterous, and utterly untrusworthy.
Killen looks a good deal shorter than Mero as described in the books, but may well capture the nature of the role quite well.
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.