Cashel Byron's Profession is George Bernard Shaw's fourth novel. The novel was written in 1882 and after rejection by several publishers it was published in serialized form in a socialist magazine. The novel was later published as a book in England and the United States. Shaw wrote five novels early in his career and then abandoned them to pursue politics, drama criticism and eventually playwrighting. The Admirable Bashville (1901), a short play based loosely on this novel, was written to protect American copyrights after the novel became unexpectedly successful in the United States'
Lydia is portrayed as moral and intelligent woman (although "priggish" according to Shaw) and is constantly contrasted with the "ruffian" Cashel. Lydia was advised by her recently deceased father to find a husband with a profession, as opposed to an idle gentleman or an art critic like her father.
Cashel’s childhood ends when he runs away from school to Australia and becomes apprentice to an ex-world champion boxer. When Cashel goes to England to secure his world title in that country he meets Lydia at her country manor. After much miscommunication and drawing room comedy, Cashel gives up boxing and succeeds in marrying Lydia. As in his postscript to "Pygmalion" (1912), in which he describes Eliza Doolittle's future life, Shaw chose to portray the Byron marriage in a realistic manner and narrates how Lydia comes to regard Cashel as "one of the children".