Who does he mean?

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Barford, Prince of the Liars declares the belligerent coin dealer on his "Ancient Coins" blog which long ago ceased to be about ancient coins. I wonder what he meant by that title? One would assume that the former student of the Jesuits had in mind something along the lines of one of the titles of the Biblical ha-satan (the accuser/ the obstrctor), which would have fitted, except Satan is referred to there (like Herodotus elsewhere) as the FATHER of Lies (Matt 8:44), but "the prince/ruler [archon] of this world" (John 14:30) and "the god of this age" (2 Corinthians 4:4). I have ascertained that the notion of the "prince of lies" however occurs in Buffy the Vampire Slayer, maybe that is where Welsh got it.

Vignette: A William Blake illustration to the book of Job. The Accuser is allowed to try the faith of the righteous man.