Prydonian Chapter

The Prydonian Chapter (also known as the Prydon Chapter) was known to produce devious Time Lords, and more than a few renegades, amongst them the Doctor.

History
No less a personage than Rassilon, co-founder of the Time Lords, originally headed the Chapter before the creation of the Time Lords themselves. (DWM: Star Death)

Subsequently, more Time Lords from this chapter have assumed the office of Lord President than all others put together. (DW: The Deadly Assassin). During the the Doctor's youth, the Prydonian Academy was located some distance up Mount Cadon. (NA: Timewyrm: Revelation)

The House of Blyledge had senior members as part of this chapter. (NA: Cat's Cradle: Time's Crucible, MA: Cold Fusion) The Doctor belonged to the House of Lungbarrow (NA: Lungbarrow)

Characteristics
Each Chapter had their own colours. The Prydonians had scarlet and orange ceremonial robes. (DW: The Deadly Assasin) The Prydonians had an abstract symbol known as the Prydonian Seal. (DW: The Five Doctors) Prydonians were noted for their cunning and that one could not take their eyes off them for a second. (BFA: Circular Time)