The Minister

The Minister was a Time Lord who went by the name Felicity Morgan whilst residing on Samael.

History
The Minister chose her title upon leaving Gallifrey as a renegade. She previously worked for the Celestial Intervention Agency and had survived nine assassination attempts on her life, regenerating each time, prior to arriving on Samael. (AUDIO: The Same Face)

Behind the Scenes
The Minister might be a reference to the similarly-named Time Lord that appeared in Death Comes to Time and would later feature as the title character in the Minister of Chance series.