http://en.wikipedia.org/wiki/The_Importance_of_Being_Earnest

If you want to learn more about this espectacular play, you can take a look at this web site.

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Characters list: 

• John (Jack/Ernest) Worthing, J.P. -  The play’s protagonist. Jack Worthing is a seemingly responsible and respectable young man who leads a double life. In Hertfordshire, where he has a country estate, Jack is known as Jack. In London he is known as Ernest. As a baby, Jack was discovered in a handbag in the cloakroom of Victoria Station by an old man who adopted him and subsequently made Jack guardian to his granddaughter, Cecily Cardew. Jack is in love with his friend Algernon’s cousin, Gwendolen Fairfax. The initials after his name indicate that he is a Justice of the Peace.
• Algernon Moncrieff -  The play’s secondary hero. Algernon is a charming, idle, decorative bachelor, nephew of Lady Bracknell, cousin of Gwendolen Fairfax, and best friend of Jack Worthing, whom he has known for years as Ernest. Algernon is brilliant, witty, selfish, amoral, and given to making delightful paradoxical and epigrammatic pronouncements. He has invented a fictional friend, “Bunbury,” an invalid whose frequent sudden relapses allow Algernon to wriggle out of unpleasant or dull social obligations.
• Gwendolen Fairfax -  Algernon’s cousin and Lady Bracknell’s daughter. Gwendolen is in love with Jack, whom she knows as Ernest. A model and arbiter of high fashion and society, Gwendolen speaks with unassailable authority on matters of taste and morality. She is sophisticated, intellectual, cosmopolitan, and utterly pretentious. Gwendolen is fixated on the name Ernest and says she will not marry a man without that name.
• Cecily Cardew -  Jack’s ward, the granddaughter of the old gentlemen who found and adopted Jack when Jack was a baby. Cecily is probably the most realistically drawn character in the play. Like Gwendolen, she is obsessed with the name Ernest, but she is even more intrigued by the idea of wickedness. This idea, rather than the virtuous-sounding name, has prompted her to fall in love with Jack’s brother Ernest in her imagination and to invent an elaborate romance and courtship between them.
• Lady Bracknell -  Algernon’s snobbish, mercenary, and domineering aunt and Gwendolen’s mother. Lady Bracknell married well, and her primary goal in life is to see her daughter do the same. She has a list of “eligible young men” and a prepared interview she gives to potential suitors. Like her nephew, Lady Bracknell is given to making hilarious pronouncements, but where Algernon means to be witty, the humor in Lady Bracknell’s speeches is unintentional. Through the figure of Lady Bracknell, Wilde manages to satirize the hypocrisy and stupidity of the British aristocracy. Lady Bracknell values ignorance, which she sees as “a delicate exotic fruit.” When she gives a dinner party, she prefers her husband to eat downstairs with the servants. She is cunning, narrow-minded, authoritarian, and possibly the most quotable character in the play.
• Miss Prism -  Cecily’s governess. Miss Prism is an endless source of pedantic bromides and clichés. She highly approves of Jack’s presumed respectability and harshly criticizes his “unfortunate” brother. Puritan though she is, Miss Prism’s severe pronouncements have a way of going so far over the top that they inspire laughter. Despite her rigidity, Miss Prism seems to have a softer side. She speaks of having once written a novel whose manuscript was “lost” or “abandoned.” Also, she entertains romantic feelings for Dr. Chasuble.
• Rev. Canon Chasuble, D.D. -  The rector on Jack’s estate. Both Jack and Algernon approach Dr. Chasuble to request that they be christened “Ernest.” Dr. Chasuble entertains secret romantic feelings for Miss Prism. The initials after his name stand for “Doctor of Divinity.”
• Lane -  Algernon’s manservant. When the play opens, Lane is the only person who knows about Algernon’s practice of “Bunburying.” Lane appears only in Act I.
• Merriman -  The butler at the Manor House, Jack’s estate in the country. Merriman appears only in Acts II and III.

Plot summary:

Jack Worthing, the play’s protagonist, is a pillar of the community in Hertfordshire, where he is guardian to Cecily Cardew, the pretty, eighteen-year-old granddaughter of the late Thomas Cardew, who found and adopted Jack when he was a baby. In Hertfordshire, Jack has responsibilities: he is a major landowner and justice of the peace, with tenants, farmers, and a number of servants and other employees all dependent on him. For years, he has also pretended to have an irresponsible black-sheep brother named Ernest who leads a scandalous life in pursuit of pleasure and is always getting into trouble of a sort that requires Jack to rush grimly off to his assistance. In fact, Ernest is merely Jack’s alibi, a phantom that allows him to disappear for days at a time and do as he likes. No one but Jack knows that he himself is Ernest. Ernest is the name Jack goes by in London, which is where he really goes on these occasions—probably to pursue the very sort of behavior he pretends to disapprove of in his imaginary brother.
Jack is in love with Gwendolen Fairfax, the cousin of his best friend, Algernon Moncrieff. When the play opens, Algernon, who knows Jack as Ernest, has begun to suspect something, having found an inscription inside Jack’s cigarette case addressed to “Uncle Jack” from someone who refers to herself as “little Cecily.” Algernon suspects that Jack may be leading a double life, a practice he seems to regard as commonplace and indispensable to modern life. He calls a person who leads a double life a “Bunburyist,” after a nonexistent friend he pretends to have, a chronic invalid named Bunbury, to whose deathbed he is forever being summoned whenever he wants to get out of some tiresome social obligation.
At the beginning of Act I, Jack drops in unexpectedly on Algernon and announces that he intends to propose to Gwendolen. Algernon confronts him with the cigarette case and forces him to come clean, demanding to know who “Jack” and “Cecily” are. Jack confesses that his name isn’t really Ernest and that Cecily is his ward, a responsibility imposed on him by his adoptive father’s will. Jack also tells Algernon about his fictional brother. Jack says he’s been thinking of killing off this fake brother, since Cecily has been showing too active an interest in him. Without meaning to, Jack describes Cecily in terms that catch Algernon’s attention and make him even more interested in her than he is already.
Gwendolen and her mother, Lady Bracknell, arrive, which gives Jack an opportunity to propose to Gwendolen. Jack is delighted to discover that Gwendolen returns his affections, but he is alarmed to learn that Gwendolen is fixated on the name Ernest, which she says “inspires absolute confidence.” Gwendolen makes clear that she would not consider marrying a man who was not named Ernest.
Lady Bracknell interviews Jack to determine his eligibility as a possible son-in-law, and during this interview she asks about his family background. When Jack explains that he has no idea who his parents were and that he was found, by the man who adopted him, in a handbag in the cloakroom at Victoria Station, Lady Bracknell is scandalized. She forbids the match between Jack and Gwendolen and sweeps out of the house.
In Act II, Algernon shows up at Jack’s country estate posing as Jack’s brother Ernest. Meanwhile, Jack, having decided that Ernest has outlived his usefulness, arrives home in deep mourning, full of a story about Ernest having died suddenly in Paris. He is enraged to find Algernon there masquerading as Ernest but has to go along with the charade. If he doesn’t, his own lies and deceptions will be revealed.