Act II of Oscar Wilde's The Importance of Being Earnest shows the flirtatious relationship between the reverend Dr. Chasuble and the prude Miss Prism as they meet during one of Chasuble's presumably usual visits to the Worthing country estate.
At the time that the reverend enters the home, Miss Prism is with Cecily performing her duties of governess. After a brief dialogue, Chasuble, referring to Laetitia Prism says
But I must not disturb Egeria and her pupil any longer.
He does this as a flirty way to play on the similarities between the name "Laetitia" and the name "Egeria". There are two different postures as far as the use of Egeria goes.
Similarly to the historically-known pagan character of the mythical "Laetitia" (Prism's first name), "Egeria" is likewise a Roman goddess.
Egeria is said to have been nymph of water and springs, and an adviser, as well as lover, to the second King of Rome, according to the pagan legend. This would have been quite a saucy, yet, subtle mischievous remark from Chasuble to Prism, who is the epitome of the prudent and prudish woman.
Also the name of Egeria belongs to a female writer from the (pagan) Roman times who is thought, thus far, to be the first ever-published woman in the history of the world. As we know, Miss Prism proudly calls herself a female writer, and also claims to have completed a novel.
Hence, the connection is two-fold between the two names. "Egeria" and "Laetitia" are both Roman goddesses. The connection of the name "Egeria" with the character of Miss Prism is also that Egeria is a pilgrim writer whose writings have made history, while Miss Prism also boasts of having written a novel, whose manuscript she claims to have "lost" or "misplaced".
It is this precisely the loss of this manuscript that incites the action in the play, for this misplacement results in the leaving of baby Jack Worthing inside of a handbag at the cloakroom of Victoria Station...the Brighton Line.