Imperial Family (Father Time)

The Imperial Family was a group of Time Lords who ruled all of space and time toward the end of the universe.

Biology
Despite resembling ordinary people, the Imperial Family had genetic privileges that set them apart from all other life in the universe, which they regarded as lesser species. They each had two hearts, and Ferran believed that their blood was continually twisting and reforming. This birthright gave them great gifts.

According to Prefect Ferran, they started a sequence of events that led to whole galaxies being evacuated and whole sections of the timeline being erased. As a result, most of space and time was left broken and dead, and the Family subjugated the survivors, who they viewed as lesser species, for two thousand years. They grew corrupt with power; each member abused their powers to satisfy their own lust for power, becoming sadists, perverts, and mass murderers. Millions were killed through their neglect, cruelty, or sport. (PROSE: Father Time)

Fall
There was a Senate, but it was powerless and lived in fear of the Emperor. The Senators were left to fight among themselves for scraps of power and wealth. However, they began to form alliances with each other through secret meetings, and a revolution began when the insurrection leader was found and murdered in the street. After a short and brutal civil war, the Imperial Family was wiped out, with the exception of the Emperor's daughter, who escaped back in time and was adopted by the Eighth Doctor. (PROSE: Father Time)