House Fossoway
The apple knights of Cider Hall. At Ashford Meadow the house splits at the stem: Ser Steffon sells his sword's honor for advantage, his cousin Raymun is knighted on the field to stand against him — and the green-apple Fossoways are born of the difference.
The fuller tale
Cider Hall's apple knights had, before 209 AC, exactly one sigil and one story worth telling casually at other lords' tables — a minor but comfortably proud Reach house, orchards more famous locally than the family holding them, its motto A Taste of Glory doing a fair amount of aspirational work for a house that had not, in living memory, actually tasted much.
Ashford Meadow gave the family its first real drama in generations, and it split the house clean down the middle in the process. Ser Steffon Fossoway chose advantage over honor when Dunk needed neither charity nor company, a small ugly decision that the tale does not let him live down quietly; his cousin Raymun chose the opposite, standing by the hedge knight when it cost him something to do it, and was knighted on the field for the choice.
Out of that single afternoon came a second branch of the family that had not existed the day before — the green apple Fossoways, taking a new sigil rather than share the old one with cousins who had disgraced it, a house literally re-founded in an afternoon on nothing but one young man's decision to behave honorably when his elder kinsman had not.
It is, in miniature, the whole argument the Dunk and Egg tales keep making about blood and deed: two men who shared a grandfather and a sigil walked away from the same field with two entirely different names, and the difference between them had nothing to do with birth at all.
The page and the screen
The Fossoway split takes place at Ashford Meadow and belongs to the events The Hedge Knight season adapted in its first run, though the show's screen time for Steffon and Raymun specifically has been considerably lighter than for the trial of seven's principal figures.