Blackthorn–Character Profile
Blackthorn is the venomous, goateed lackey for the Guardian.  He was originally a citizen of Britannia who was justly punished by Lord British, but, like a petulant child, feels wronged.  As a result, he has set out to  thwart Lord British by whatever means necessary.  The Guardian recognized him as an easy convert to his ends and brought Blackthorn into his supposed confidence so as to use him as his right hand goon.