The Amateur Gentleman is a novel by Jeffery Farnol, published in 1913.
They settle their differences in a round of fisticuffs, which Barnabas wins, beating his father fair and square.
Barnabas sets off for London to further his ambitions and, on the way there, contrives to make a number of influential friends and enemies.
For instance, Barnabas is gulled by the chapman who sells him a book on etiquette at an outrageous mark-up.
At the other end of the spectrum, Farnol is equally disdainful of Barnabas' sophisticated concealment of his identity.