HMS King Roger was an King William-class superdreadnought of the Royal Manticoran Navy.
The ship was commissioned in the 19th Century PD and named after King Roger I, the first monarch of the Star Kingdom of Manticore.
In 1900 PD, King Roger was the flagship of the Manticoran Home Fleet under the command of Admiral of the Green Sebastian D'Orville. The ship participated in a series of war games and was "destroyed" by an experimental weapon called grav lance fired from HMS Fearless.
A few months later, when Fearless returned to the Manticore System after the First Battle of Basilisk, King Roger flashed its lights in acknowledgment. (HH1, OBS)