The French influences in the nobility would likely have them saying "small meal" or "little dinner" for breakfast (Petit-dejeuner). Breaking away from that though... Breakfast, according to dictionary.com, had recorded and written usage by the more commoner/priestly castes as early as 1425. Which, you know, is well within the 15th-century.
Which I think falls into the "modern British accent paradox" thing, where Americans have closer to the original British accent than British people do, because almost as a nation, Britain changed their accent to distinguish themselves from the colonies, meaning the established colonies had the legacy and original accent remain. But despite that, you'd 100% expect a medieval British castle guard to sound more "oi guvnah" than "Howdy do".
"Broke fast" sounds more medieval, even if "Brekky" or "breakfast" was likely common-enough parlance.
Neither usage is ideal.
The French influences in the nobility would likely have them saying "small meal" or "little dinner" for breakfast (Petit-dejeuner). Breaking away from that though... Breakfast, according to dictionary.com, had recorded and written usage by the more commoner/priestly castes as early as 1425. Which, you know, is well within the 15th-century.
Which I think falls into the "modern British accent paradox" thing, where Americans have closer to the original British accent than British people do, because almost as a nation, Britain changed their accent to distinguish themselves from the colonies, meaning the established colonies had the legacy and original accent remain. But despite that, you'd 100% expect a medieval British castle guard to sound more "oi guvnah" than "Howdy do".
"Broke fast" sounds more medieval, even if "Brekky" or "breakfast" was likely common-enough parlance.