Rassilon was the Grand Master of the Prydonian Chapter even before the Gallifreyans would become Time Lords. (COMIC: Star Death) At the time, the Chapter was attacked by the Order of the Black Sun in its Question Hall. (COMIC: 4-D War)
Subsequently, more Time Lords from this chapter assumed the office of Lord President than all others put together. (TV: The Deadly Assassin) By the time of the Valeyard's trial, there had not been a non-Prydonian president for centuries. (AUDIO: Trial of the Valeyard) This Chapter greatly opposed the creation of the N-Forms. (PROSE: Damaged Goods)
The House of Blyledge had senior members as part of this chapter. (PROSE: Cat's Cradle: Time's Crucible, PROSE: Cold Fusion) The Doctor and his Cousins belonged to the House of Lungbarrow. (PROSE: Lungbarrow)
Each Chapter had its own colours. The Prydonians had scarlet and orange ceremonial robes. (TV: The Deadly Assassin) The Prydonians had an abstract symbol known as the Prydonian Seal. (TV: The Deadly Assassin, The Five Doctors) Prydonians were noted for their cunning. One could not take their eyes off them for a second. (AUDIO: Spring) Whilst they were known to be devious, it was believed that they were quite honest about this trait amongst their Chapter. (PROSE: Damaged Goods) Members of this chapter swore "Prydonian vows"; it was thought that once a Prydonian had forsworn those vows and their "birthright" as a Prydonian, they would be especially dangerous. (TV: The Deadly Assassin)
Behind the scenes Edit
The relationship between the Prydonian Chapter and the Prydonian Academy is unclear because Paul Cornell, inventor of the Prydonian Academy, never directly specified a relationship, aside from mentioning that the students of the Prydonian Academy wore scarlet robes. This can no longer be seen as particular evidence, in light of the fact that The End of Time, The Day of the Doctor, and Hell Bent had all Time Lords dressed in scarlet.