The Conqueror, previously named Peacekeeper, was once under the employ of a Falleen warlord named Xzuhal, but then shifted over to Cadden Blackthorne's employ. Its crew consisted of those that were once onboard the Grace, a ship leftover from Cadden's Blackthorne Enterprises that was loyal to him, but during the face-off against the Conqueror the Grace was badly damaged and, in a last-ditch effort, the crew scuttled and transfered to the dreadnaught as their ship collided with the other.
The Conqueror then wandered the galaxy, awaiting Cadden's orders. It eventually became associated with the Mandalorians, receiving repairs and a full roster of crew later, in orbit above Mandalore. The Conqueror was an active participant in the New Mandalorian Crusade, acting as the command ship directing the Mandalorian rebuidling effort.
However, the ship and its occupants were destroyed during the Battle of Mandalore, marking an end for the Dreadnaught's service to Blackthorne, and the Mandalorians.