Juliet Capulet is the lead female, in the classic Shakespeare play, Romeo and Juliet, and its many adaptions, and parodies. She is the love interest of Romeo. Juliet is a member of the Capulet family, who's family is the enemy of the Montague family.
When Juliet goes to a ball one night, Romeo, who is a member of the Montague family, sneaks in, and the two meet, and instantly fall in love with each other. The two know that they can't be together, because their families hate each other. That night, Romeo sneaks into the Capulet's orchid, and hears Juliet on her balcony, vowing her love to him in spite of her family's hatred of the Montagues. Romeo calls out to her, and tells her he feels the same way, and the two marry secretly.
When the two families begin to learn what happened, chaos breaks out. Juliet decides to fake her death, by drinking a drug that would put her into a deathlike coma for 48 hours. Then once her family thinks she is dead, she would run away with Romeo. Unfortunately, Romeo finds Juliet in this state, and, not realizing she isn't really dead, commits suicide to be with her. Once Juliet wakes up from her state, she finds Romeo dead, and stabs herself with a dagger, killing herself. When the feuding families find out what happened, they reconcil, and end their long feud, as they burry the "star-crossed lovers".