Graham Shelby's 1972 novel The Oath and the Sword (aka The Villains of the Piece), focuses on Empress Matilda's faithful supporter Brien FitzCount, Lord of Wallingford, through the years of the Anarchy.
The Kings of Vain Intent (1970), sequel to the above, dealing with the Third Crusade, depicting Conrad of Montferrat as the villain: the US edition contains an additional chapter.
In Graham Shelby's The Knights of Dark Renown and The Kings of Vain Intent, he is depicted as a young romantic hero, in a doomed relationship with Isabella.
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Guy has also appeared in a number of historical novels, including Zofia Kossak-Szczucka's Król trędowaty (The Leper King), Graham Shelby's The Knights of Dark Renown, and Cecelia Holland's Jerusalem, generally as a good-looking but weak and foolish young man.