Kaston Iago

 was an assassin. He was also a fugitive from the interplanetary Federation. He was born on Earth and has variously claimed his real name to be either "Frank Archer" or "Paul Darrow". (AUDIO: Metafiction)

Rebelling against the Federation
Iago was once convinced of embezzlement, he defrauded the Federation bank for either five million or five hundred million. One of those sums refers to the amount he was convicted for, the other the amount he got away with. He was sentenced to life on a penal planet. Fourth months into an eight month journey to the planet, Iago managed to escape from the prison ship along with two fellow prisoners when the ship became involved in a salvage operation to recover an alien spacecraft.

Once in control of the alien spacecraft, Iago, along with his two comrades, set course for the penal planet to rescue additional crew members, arriving three hours later just as the prison ship was docking. (AUDIO: Metafiction)

Life on Kaldor
By 2889, he was hiding from the Federation on the planet Kaldor. He committed a series of random murders in Kaldor City so that Kiy Uvanov would hire him as a bodyguard. (AUDIO: Occam’s Razor)

Behind the scenes

 * It was hinted but not stated officially that Iago was a pseudonym of the Blake's 7 character Kerr Avon. AUDIO: Metafiction summarizes the whole plot of Blake's 7 without using any proper names.
 * The names he claims to be his "real" name in AUDIO: Metafiction are Paul Darrow (the name of the actor who portrays Iago) and Frank Archer (the name of his character in The Time Waster audio play).