Triumvirate Treason was the name of a group of three Privateers who kinda mutinied, but are still considerd Privateers, well, probably because MB wasn't in the mood to expand the storyline.
It is easy to tell the three from the rest of their crew, because of their blue jackets. All three come with the crew collection.
Includes:
Bartholamew Jackson
Stevedore Springfield
Bios:
Charlie-- Leader of secret Triumvirate Treason gang, searching for the finer things in life.
Bartholamew Jackson-- Devious Triumvirate Treason strategist with a taste for fish guts.
Stevedore Springfield-- Easily angerd weapons master for the Triumvirate Treason gang.
All of that came from the official Crew Collection set, it's not made up.
Braggart T. Doyle from Smugglers Fort 2.0 is a Privateer also with a blue jacket but he is NOT part of the Triumvirate Treason.