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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A kinsmen of House Lannister.
This is a new character, not drawn from the books, and the details of his exact relationship to the main line of the Lannister family is a matter of speculation. It has been suggested that Alton may play a role similar to Ser Cleos Frey in the novel, as that character has a Lannister mother and in fact fights for the Lannister side in the war.
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.