[1] According to attack pieces in The Satirist, or Monthly Meteor, he was "countenanced" by Matthew "Monk" Lewis and Thomas Moore,[1][2] and frequented the green room of Drury Lane Theatre until Charles Mathews and other actors complained he was spying for scandalmonger Anthony Pasquin.
[4] In 1809, Mary Anne Clarke, the royal mistress of Prince Frederick, Duke of York and Albany was about to publish scandalous Memoirs, until Gilliland helped arrange a deal to buy and destroy the publishers' copies.
[5] Many attacks on the Duke were published the same year and erroneously rumoured to have been Clarke's memoirs.
[8] Edmund Henry Barker's Literary Anecdotes and Contemporary Reminiscences includes several he heard from Gilliland when both were imprisoned for debt in the Fleet in 1837.
[9] Gilliland wrote: The engraver John Thomas Smith called Gilliland "my worthy friend" and "author of the celebrated pamphlet of 'Diamond cut Diamond,' and, I believe, about sixteen or seventeen others in defence and support of the English government".