For the Regency novelist:
edkf = the Duke of
edkhf = the Duchess of
eerlf = the Earl of
ldy = Lady
hlorp = his Lordship
hlap = her Ladyship
wlgtn = Wellington
wloo = Waterloo
npln = Napoleon
bnpt = Bonaparte
nbon = Napoleon Bonaparte
g3 = George III
g4 = George IV
hrh = HRH
hrhh = His Royal Highness
bbml = Beau Brummell
And so many more! --
besdriclub = Bensinton Driving Club
almks = Almack’s
ldybesbro = Lady Bessborough
ldycaslri = Lady Castlereigh
ldyclam = Lady Caroline Lamb
ldycwpr = Lady Cowper
ldyefos = Lady Elizabeth Foster
ldyjsy = Lady Jersey
ldymelbn = Lady Melbourne
ldysftn = Lady Sefton
fopa = faux pas
plmt = Parliament
btn = Brighton
wymth = Weymouth
And more . . .