Castellan

The Castellan of the Chancellery Guard, (TV: The Deadly Assassin) also known simply as the Castellan, was a high-ranking Time Lord who oversaw the Chancellery Guard.

Role
The commanders of the Chancellery Guard reported to the Castellan. As the Guard were responsible for security within the Capitol and the personal security of the President, the Castellan was often in direct conflict with the Coordinator of the CIA whose remit was external threats to the planet or to the integrity of the timeline. (AUDIO: Pandora) The Castellan was the Capitol equivalent of a Chief of Police. (PROSE: The Eight Doctors)

Castellans often served on the High Council, but not always; Castellan Spandrell, for example, was not a High Council member. (TV: The Deadly Assassin, Arc of Infinity, The Five Doctors) In Spandrell's time, the Castellan's duties involved him more frequently with the "plebeian classes" of Gallifrey than with suspect Time Lords. (TV: The Deadly Assassin) Castellan Kelner, by contrast, was second in line to the Presidency, after the Chancellor. (TV: The Invasion of Time)

The position was mandated by some of the most ancient and powerful Gallifreyan laws. (AUDIO: Lies) Even so, the laws of Gallifrey apparently gave the Presidency wide discretion in deciding which matters were handled by the Castellan, and which by the Coordinator. Lady President Romana II, for instance, once simply chose which of the two she wanted to handle a matter. (AUDIO: Pandora)

History
There may have been a Castellan for each of the Chapters, with one of them serving as the "duty Castellan" in overall charge of the rest. Often the Castellans had served in the Chancellery Guard prior to their elevation. Both Maxil and Andred served in this way. Others appear to have been political appointments, like Kelner (TV: The Invasion of Time) and Wynter. (AUDIO: Lies, Pandora, PROSE: Lungbarrow)

Nine of one Castellan's strike force were killed by members of the Order of the Black Sun during the Black Sun War. (COMIC: 4-D War)

The rogue Time Agent Scott Thrower took the alias of "Castellan Bond" on Helion in an attempt to use the solstice of Pajaro to rejuvenate himself, accompanied by a group of Gizou mercenaries disguised as Chancellery Guards. (COMIC: Time Fraud)

In her position as the caretaker of House Ixion and leader of the Order of the Weal, Thessalia claimed the title Chatelaine, the feminine equivalent of "castellan". (PROSE: The Book of the War)

Known Castellans
Castellans throughout Gallifreyan history included Rannex, (PROSE: Divided Loyalties) Lode, (PROSE: Love and War) and Voran. (PROSE: The Infinity Doctors)

Marnal was Castellan before the Doctor left Gallifrey. (PROSE: The Gallifrey Chronicles)

Spandrell was Castellan when the President was assassinated by Goth. (TV: The Deadly Assassin)

Kelner was Castellan at the time that the Fourth Doctor returned to Gallifrey to claim the office of Lord President when the planet was invaded by the Vardans and later the Sontarans. (TV: The Invasion of Time)

Jerricho was Castellan for sometime during the life of the Doctor's fifth incarnation. He was killed trying to escape the mind probe by Gallifreyan Guards. (TV: Arc of Infinity, The Five Doctors)

Andred was Castellan until his disappearance. He eventually came back to hold office again until his death. (PROSE: Lungbarrow, AUDIO: Insurgency)

Wynter was appointed Castellan to replace Andred, who had vanished sometime before, revealing he had been posing as another Time Lord, namely Torvald. (AUDIO: Lies)

Leela was acting Castellan at one time. (AUDIO: Pandora)

Maxil was promoted to Castellan shortly after the supposed death of Andred. (AUDIO: Lies, Imperiatrix) After siding with Pandora and Inquisitor Darkel in the Gallifreyan Civil War, he was demoted back to Commander. (AUDIO: Appropriation, Warfare)

Annos was acting Castellan at one time. (AUDIO: Mindbomb)

K9 Mark II was Castellan in an alternate timeline. (AUDIO: Reborn)

An unnamed male Castallan held office when the Eleven escaped. (AUDIO: The Eleven) Yet another held office during the Last Great Time War. (PROSE: Engines of War)

Castelão