House Mormont is an old house of The North, though not an ancient house like The Starks. However, as of the events of ASoIaF, The Mormonts are one of the principal families that are sworn to House Stark. Perhaps even more so with events that have transpired during ASoIaF if we base our assumptions on the yet-to-be-published-yet-already-adapted-material that takes place during HBO's Game of Thrones.
If there was a House Dumb-Idiot of StupieLand, the matriarch would be Catelyn Stark (or Tully, as it were) and the sigil for House Dumb-Idiot would be a crude depiction of the synapses in Catelyn's brain lighting up as she takes advantage of a situation to further her personal agenda of escaping from the North and stumbling into her own circle of power in the South.
Listen here... https://pinecast.com/listen/c23b1369-cca9-447a-9dd8-bf4bed5395ed.mp3 Or listen there... https://the-princes-that-were-promised.pinecast.co/episode/c23b1369-cca9-447a-9dd8-bf4bed5395ed Or go somewhere else... Apple Podcasts GooglePlay Stitcher
The Dragon and The Wolf gets run through The Seven-Pointed Star as #TPTWP cover the Season 7 Finale of HBO's Game of Thrones.
The Princes That Were Promised- In Summation of Game of Thrones Season 1... Click on either link to hear the first episode of The Watchers On The Couch Official Rewatch... https://pinecast.com/player/783a4713-76e2-474e-96b7-86651b822673 Or... The Watchers On The Couch Official Rewatch:Season 1, Part 1