Notes on social class

Royalty refers to queens, kings, princes and princesses.

Nobility refers to anyone with a title such as Lord/Lady, Duke/Duchess, Count/Countess, etc. Knights are not part of the nobility.

Gentry were the rich land-owning classes. Knights ("Sir Suchandsuch") were considered part of the gentry, not the nobility.

Middle class is a catch-all modern term encompassing merchants, prosperous freeholders, burgesses, and so on.

Lower class is a catch-all modern term encompassing peasants, labourers, etc.