In written sources I've read of Henry VIII's time the King is referred to as Grace (as nowadays a duke is) so it's probable that the Majesty appellation became current. But when exactly? And why?
(Asked after reading this answer in SciFi&Fantasy SE): I think that whole Stark (York) and Lanister (Lancaster) feud is reference to War of Roses. Both houses descended from house Plantagenet ...
I'm working on doing background research for one of my novels and I'm looking for roughly how old a male in the peasant class would've lived around 5th or 6th century Britain.