Decades ago,
"The Long Midnight of Barney Thomson" , Douglas Lindsay's first BT book,
was published by an existing publishing house.
By the time "The Long Midnight" was adapted for cinema and actually filmed,
with the film variously titled
"The Legend of Barney Thomson" or, more brief, "Barney Thomson" ,
Lindsay had published six sequels, and his publishing company
(at least on ink and paper -- online might be different)
was titled Long Midnight Publishing.

It is LMP which has published, under copyright,
"Aye, Barney."   My paperback copy sits to my left at the moment.

So what I quote is, of course, under copyright:
"... look, in 546 AD, Ailsa Craig was its own realm with a king and tax-raising powers, or whatever, until it lost the battle of Turnberry Beach,
which was started illegally by sleeper agents of Pope Pious the whateverth."   
&Ccopy; 2018 Douglas Lindsay

The preceding is part of a consideration of "micro-independence."
This is relevant to "Aye, Barney," as the book (288 pages) takes place
on the island of Cumbrae, and some particularly daft persons
are thinking of going micro-independent
and ruling the island regardless of Scotland or the UK.

Finally, a hint, which may serve as a warning,
given that this is one of a series of serial-murder mysteries:   

Flesh-eating.          Caveat emptor. (I liked it.)