Sabbath Dei

Biography
Sabbath was born in 1740. Studied at Cambridge and he worked for the Secret Service before defecting in 1780.

Sabbath encountered "Leviathan" under the River Thames as part of his indoctrination ceremony into the Service. He then began setting up his own powerbase independent of the Service. Leaving the Service, Sabbath sent a message via a number of corpses of the Service's "ratcatchers" saying "leave me alone, and I'll leave you alone".

The Doctor named Sabbath as his best man at his wedding to Scarlette. Sabbath later removed the Doctor's second heart to allow him to travel through time in the Jonah. (EDA: The Adventuress of Henrietta Street)

Sabbath had a group of agents which in many ways were to him the same as companions were to the Doctor. Among Sabbath's agents were: Sasha and Jueves. (EDA: History 101) Jaxa and Roja, former Time Agents. (EDA: Trading Futures) The Angel Maker (aka Elizabeth Kelly). (EDA: Camera Obscura)

Sabbath once organised for the Doctor and the Clock People to meet on a Plutocratic Empire colony planet. (EDA: Anachrophobia)

Nearly dying Sabbath once meet Death, then returned the Doctor's second heart to him. (EDA: Camera Obscura)

Sabbath later assisted Fitz Kreiner, Anji Kapoor and the Doctor when multiple realities began to converge and mix. (EDA: The Last Resort) Sabbath was finally killed after turning his back on his employers and helping the Doctor. (EDA: Sometime Never...)

Alternate Versions
A Sabbath existed in at least one alternate timeline where he apparently knew the Doctor by reputation (but not face). (EDA: The Domino Effect)

In the timeline where the "War in Heaven" is still being waged, Sabbath became a member of Faction Paradox, rather then becoming an agent of beings attempting to replace the Time Lords. He is also used as an agent of the Great Houses to hunt Justine. His personality is similar to that in the regular time line. (FP: Movers)

Personality
Sabbath was generally opposed to chaos and believed that unauthorised time travel created parallel universes, which in turn threatened reality. (EDA: Camera Obscura)

Sabbath was confident in his mental abilities, aided by the Doctor's second heart he survived a journey into Death's realms. (EDA: Camera Obscura) He was incredibly stubborn and he disliked beings who lord their powers over other beings, which included the Doctor.

Habits and quirks
Sabbath adopted many pseudonyms, often variations upon his chosen name of Sabbath. (EDA: Time Zero) Although he had an outward disregard for his agents, he was fiercely loyal to them. (EDA: The Adventuress of Henrietta Street)

Appearance
Sabbath was bulky and muscular, however his body was shifting towards the other side of overweight. He kept his head almost shaved, a very thin layer of hair away from totally shaved. He shaved his head not as a political statement or an attempt to intimidate people, but as a way of saving time and energy in relation to personal grooming. (EDA: The Adventuress of Henrietta Street) Much of Sabbath's clothing choices echoed the Doctor's, for example wearing a linen suit after adopting the role of Time's Champion.