The Emperor

The Emperor was the ruler of the universe in the far future.

Biography
For a thousand years the Emperor reigned over the entire universe, controlling time and space travel via a ruthless secret police force. He crushed any rebellion before it happened. The Emperor controlled the Senate of his empire through fear. He ruled from his throne on the Needle. (EDA: Father Time)

Endpoint was one of the planets in the Emperor's empire. (EDA: Hope)

On the night of his daughter, Miranda Dawkins' birth, the Emperor was assassinated. The entire empire fell into chaos overnight. (Miranda)

The Emperor was seen in a vision by the Eighth Doctor and Marnal as one of the last surviving Time Lords after the destruction of Gallifrey. In the vision, the Emperor was holding his daughter in his arms. (EDA: The Gallifrey Chronicles)