Imperial family

The Imperial family ruled the human empire. Emperor Ludens Nimrod Kendrick Cord Longstaff XLI was a member of the Imperial family, succeeding the old Emperor. When Clara Oswald remarked that a waxwork of the Emperor made him look "a bit full of himself", Porridge advised her against saying such things about the Imperial family, warning her that she could end up on the run for the rest of her life. Unbeknownst to Clara at the time, "Porridge" actually was the Emperor. (TV: Nightmare in Silver)