 The Doctor suggests that the Master went mad, while admitting that he ran away.Each Time Lord belongs to one of a number of various colleges or chapters, such as the Patrexes, Arcalian, and the Prydonian chapters, which have ceremonial and possibly political significance.In "The Deadly Assassin", it is explained that each chapter has its own colours; the Prydonians wear scarlet and orange, the Arcalians wear green, and the Patrexeans wear heliotrope.