Downtonian

(As all Downtonians know, this, too, turns out to be felicitous when after much travail, cousin Matthew and Lady Mary happily wed at the beginning of season three.)

The stage names of the Lower Devonian (Downtonian, Dittonian and Breconian) and of the Upper Devonian (Farlovian) are all derived from localities in Shropshire or Breconshire.