I loathe the myself/yourself trend but keep noticing it in novels I love. Dumbledore is a repeat offender, as are the cast of Pride and Prejudice.
"I assure you, that if Darcy were not such a great tall fellow, in comparison with myself"
"I cannot forget the follies and vices of others so soon as I ought, nor their offenses against myself."
His behaviour to myself has been scandalous"
the affection she inspires in Louisa and myself is heightened into something still more interesting"
Dumbledore:
"My dear Professor, surely a sensible person like yourself can call him by his name? All this ‘You-Know-Who’ nonsense."
"Well, they did rather detest each other. Not unlike yourself and Mr. Malfoy."
I'm sure I've noticed it in other classics, so was it a feature of the time?
As for Dumbledore though...