Patrex Chapter

The Patrex Chapter (plural, Patrexes) was one of the six Colleges or Chapters of Time Lord society. The Patrexes wore heliotrope robes. (DW: The Deadly Assassin) The Patrexes are an order of artists and aesthetes, but they lacked any true imagination and are minor players in Time Lord politics. One of their duties included scanning into the future as far ahead as possible. (source?)