Question: What is the name of the main antagonist, son of Lady Capulet's brother and who was slain in a duel by Romeo Montague?

full_context: Document 1: Juliet: Juliet Capulet (Italian: "Giulietta Capuleti" ) is the female protagonist in William Shakespeare's romantic tragedy "Romeo and Juliet". Juliet is the only daughter of the patriarch of the House of Capulet and falls in love with Romeo, a member of the House of Montague (with which the Capulets have a blood feud). The story has a long history that precedes Shakespeare himself.
Document 2: Romeo + Juliet: William Shakespeare's Romeo + Juliet (shortened to Romeo + Juliet) is a 1996 American romantic drama film directed, co-produced, and co-written by Baz Luhrmann, co-produced by Gabriella Martinelli, and co-written by Craig Pearce, being an adaptation and modernization of William Shakespeare's tragedy "Romeo and Juliet". The film stars Leonardo DiCaprio and Claire Danes in the leading roles of Romeo and Juliet, who instantly fall in love when Romeo crashes a party and meets her, despite their being members of the Montague and Capulet family; Brian Dennehy, John Leguizamo, Pete Postlethwaite, Paul Sorvino, and Diane Venora star in supporting roles.
Document 3: Rosaline: Rosaline ( or ) is an unseen character and niece of Capulet in William Shakespeare's tragedy "Romeo and Juliet" (1597). Although silent, her role is important. Romeo is at first deeply in love with Rosaline and expresses his dismay at her not loving him back. Romeo first spots Juliet while trying to catch a glimpse of Rosaline at a gathering hosted by the Capulet family.
Document 4: Tybalt: Tybalt is the main antagonist in William Shakespeare's play "Romeo and Juliet". He is the son of Lady Capulet's brother, Juliet's short-tempered first cousin, and Romeo's rival. Tybalt shares the same name as the character Tibert/Tybalt the "Prince of Cats" in "Reynard the Fox", a point of mockery in the play. Mercutio repeatedly calls Tybalt "Prince of Cats" (perhaps referring not only to Reynard but to the Italian word cazzo as well). Luigi da Porto adapted the story as "Giulietta e Romeo" and included it in his "Historia novellamente ritrovata di due Nobili Amanti" published in 1530. Da Porto drew on "Pyramus and Thisbe" and Giovanni Boccaccio's "Decameron". He gave it much of its modern form, including the lovers' names, the rival families of Montecchi and Capuleti, and the location in Verona. He also introduces characters corresponding to Shakespeare's Mercutio, Tybalt, and Paris. Da Porto presents his tale as historically true and claims it took place in the days of Bartolomeo II della Scala (a century earlier than Salernitano). Montague and Capulet were actual 13th-century political factions, but the only connection between them is a mention in Dante's" Purgatorio" as an example of civil dissension.
Document 5: Romeo × Juliet: Romeo × Juliet (ロミオ×ジュリエット , Romio to Jurietto ) is an anime television series, loosely based on William Shakespeare's classical play, "Romeo and Juliet", along with numerous references and characters from other Shakespearean plays. Though the anime borrows mostly from Shakespeare's story, the manga adaptation differs extensively from the original. "Romeo × Juliet" was broadcast in Japan on Chubu-Nippon, broadcasting from April 4, 2007 to September 26, 2007. In 2009, "Romeo × Juliet" was dubbed into English and released by Funimation Entertainment.
Document 6: Mercutio: Mercutio ( ) is a fictional character in William Shakespeare's 1597 tragedy, "Romeo and Juliet". He is a close friend to Romeo and a blood relative to Prince Escalus and Count Paris. As such, being neither a Montague nor a Capulet, Mercutio is one of the few in Verona with the ability to mingle around those of both houses. The invitation to Capulet's party states that he has a brother named Valentine.
Document 7: Count Paris: Count Paris or County Paris is a fictional character in William Shakespeare's "Romeo and Juliet". He is a suitor of Juliet. He is handsome, wealthy, and a kinsman to Prince Escalus.
Document 8: Characters in Romeo and Juliet: Prince Escalus, the Prince of Verona, is the desperate resolver of the feuding families. He is based on the actual Scaligeri family which ruled Verona, possibly on Bartolomeo I. Escalus is the voice of authority in Verona. He appears only three times within the text and only to administer justice following major events in the feud between the Capulet and Montague families. He first punishes Capulet and Montague for the quarrel between Tybalt, Benvolio, and a handful of servants. He returns too late to stop the fatal brawls between Tybalt and Mercutio and, subsequently, Tybalt and Romeo. Escalus is prepared to execute Romeo for his offence—Romeo's killing Tybalt—but lightens the sentence to lifetime banishment from Verona, when Benvolio insists that Tybalt started the quarrel by murdering Mercutio, a kinsman to the Prince. He yells at Lord Montague for engaging in the feud, which really is the root cause which led to Tybalt killing Mercutio. So, according to him, he lost his dear kinsman because of Lord Montague, so by exiling Romeo, Escalus gives him a 'taste of Montague's own medicine', to see how Montague feels when he loses a loved one. Prince Escalus returns in the final scene—V.iii—following the double suicide of Romeo and Juliet, and at last declares the Lords Montague and Capulet guilty of Romeo and Juliet's death, and angrily tells them that their totally useless feud resulted in the deaths of not only their own loved ones (Lady Montague, Romeo, Juliet, and Tybalt), but also in the deaths of Escalus' loved ones (Mercutio and Paris). He curses the feud that kills Romeo and Juliet whom he really feels sad for, just before the Lords come to peace with each other. In the end, Prince Escalus becomes very happy that the feud has finally ended, even if with a heavy price, since it ended late.
Document 9: Romeo: Romeo Montague (Italian: "Romeo Montecchi" ) is the protagonist of William Shakespeare's tragedy "Romeo and Juliet". The son of Montague and his wife, he secretly loves and marries Juliet, a member of the rival House of Capulet. Forced into exile after slaying Juliet's cousin, Tybalt, in a duel, Romeo commits suicide upon hearing falsely of Juliet's death.
Document 10: A rose by any other name would smell as sweet: "A rose by any other name would smell as sweet" is a popular reference to William Shakespeare's play "Romeo and Juliet", in which Juliet seems to argue that it does not matter that Romeo is from her rival's house of Montague, that is, that he is named "Montague." The reference is often used to imply that the names of things do not affect what they really are. This formulation is, however, a paraphrase of Shakespeare's actual language, seen underlined below. This scene is called the balcony scene by many people. Juliet not only makes the statement above but compares Romeo to a rose saying that if he wasn't named Romeo he would still be handsome and be Juliet's Love. Also as said before this states that if he wasn't Romeo, then he wouldn't be a Montague and she would be able to get married with no problem at all.
Document 11: Romeo &amp; Juliet: Sealed with a Kiss: Romeo & Juliet: Sealed with a Kiss is a 2006 American animated romantic fantasy film loosely following the play "Romeo and Juliet" by William Shakespeare. The film is about two star-crossed seals, Romeo and Juliet (voiced by Daniel and Patricia Trippet respectively), who fall in love against the wishes of their warring families. It was released in Europe in mid-2006 and on October 27 in the United States.
Document 12: I Capuleti e i Montecchi: I Capuleti e i Montecchi ("The Capulets and the Montagues") is an Italian opera ("Tragedia lirica") in two acts by Vincenzo Bellini. The libretto by Felice Romani was a reworking of the story of "Romeo and Juliet" for an opera by Nicola Vaccai called "Giulietta e Romeo" and based on the play of the same name by Luigi Scevola written in 1818, thus an Italian source rather than taken directly from William Shakespeare.
Document 13: Romeo and Juliet (1954 film): Romeo and Juliet is a 1954 film adaptation of William Shakespeare's play of the same name. It was directed by Renato Castellani and stars Laurence Harvey as Romeo, Susan Shentall as Juliet, Flora Robson as the Nurse, Mervyn Johns as Friar Laurence, Bill Travers as Benvolio, Sebastian Cabot as Lord Capulet, Ubaldo Zollo as Mercutio, Enzo Fiermonte as Tybalt and John Gielgud as the Chorus.
Document 14: Benvolio: Benvolio is a fictional character in Shakespeare's drama "Romeo and Juliet". He is Montague's nephew and Romeo's cousin. Benvolio serves as an unsuccessful peacemaker in the play, attempting to prevent violence between the Capulet and Montague families.
Document 15: Romeo and Juliet: Romeo and Juliet is a tragedy written by William Shakespeare early in his career about two young star-crossed lovers whose deaths ultimately reconcile their feuding families. It was among Shakespeare's most popular plays during his lifetime and along with "Hamlet", is one of his most frequently performed plays. Today, the title characters are regarded as archetypal young lovers.
ground_truth: Tybalt