Sixth Great and Bountiful Human Empire

The Sixth Great and Bountiful Human Empire was a human empire in the 78th century. On 4 May 7791, its Doom Moon was destroyed. (PROSE: Time Traveller's Diary)

Behind the scenes

 * The Fourth Great and Bountiful Human Empire existed by the year 200,000 (TV: The Long Game), several millenia after the Sixth, which, according to Time Traveller's Diary, existed by 7791. This is likely an accidental continuity mistake.