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?

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. <SEP> 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. <SEP>  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". Tybalt is the main antagonist in William Shakespeare's play "Romeo and Juliet".  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. <SEP> Thea Louise Señerez Tolentino (born 13, August 1996 in Calamba, Laguna, Philippines), better known for her screen name.  Thea Tolentino, is a Filipina actress known for her role as Ashley Mercado Alcantara in the GMA Network television drama "The Half Sisters", Tolentino started her career as one of the winners of the of the reality show, "Protégé", a reality based "artista" search, created by GMA Network.  Since then, she became a contract artist of GMA and began appearing on their television dramas such as "Teen Gen", "Anna Karenina," and "", Previously years 2016, she joined the cast in "Hahamakin ang Lahat" played the role as Phoebe-Ke, the main antagonist of the cast, In 2017, she joined the cast as the main antagonist Trish to Sinag (Mendoza) and Benjie's mistress (Richards).  Began 2017, Tolentino joined the cast in "Haplos" as Lucille, the main antagonist of the series.  She will also star in an upcoming movie entitled "This Time I'll be Sweeter" as the main antagonist that headlines Ken Chan and Barbie Forteza, her co-star in the critically acclaimed series "The Half Sisters".