Do you mean the first two lines "There is a town beyond the Alps, a town of ancient fame, whose bright renown yet shineth clear: Verona is its name."? Or perhaps it is "And I as well contented am as if myself alone did from the Ocean reign unto the sea of Ind" (Around line 878; "Ind" here means India.)
You did ask about the poem Romeus and Juliet by Arthur Brooke, not the play Romeo and Juliet by William Shakespeare.
juliet
An example of allusion in Shakespeare's work is in "Romeo and Juliet," when Romeo compares Juliet to the sun during their first meeting: "But, soft! What light through yonder window breaks? It is the east, and Juliet is the sun." This alludes to the idea of the sun being a source of light and warmth, conveying the intensity of Romeo's feelings for Juliet.
Juliet makes an allusion to Phoebus when she refers to the sun god, Apollo, who drives the chariot of the sun across the sky. This allusion highlights the power and brightness of Romeo in her eyes.
I don't know if you are talking about the famous poem Romeus and Juliet, written by Arthur Brooke, or the famous play Romeo and Juliet, written by William Shakespeare, or the famous symphonic poem Romeo & Juliet, written by Tchaikovsky, or the famous dramatic symphony Romeo et Juliet, written by Berlioz, or the famous opera Romeo et Juliette, written by Gounod, or the famous ballet Romeo and Juliet, written by Prokofiev, or the famous popular song Romeo and Juliet written by Mark Knopfler.
Speak to my gossip Venus
Speak to my gossip Venus
An example of an allusion is referring to someone as a "modern-day Romeo" to suggest they are romantic and passionate like the character from Shakespeare's play "Romeo and Juliet." This references the familiar story and character to help create a specific image or understanding for the audience.
The most famous quote from Romeo and Juliet is by Juliet saying 'Romeo, Romeo, where fore art thou Romeo' which basically means 'Romeo Romeo why are you Romeo'
Romeo and Juliet is the more popular.
Gallop apace, you fiery-footed steeds towards Phoebus' lodgings.
It is difficult to say. Most people have heard of Hamlet and Romeo and Juliet. They know the plays they studied in school. Many of them will not have any contact with Shakespeare after.
Romeo and Juliet