Tybalt
Mercutio steps in and fights Tybalt instead.
Tybalt calls Romeo a "villain" in Act 3, Scene 1 of Romeo and Juliet.
6: The servants Sampson and Gregory of the Capulets fight the servants Balthasar and Abram of the Montegues. Benvolio Montegue fights Tybalt Capulet. Mercutio Montegue fights Tybalt Capulet. Romeo Montegue fights Tybalt Capulet. Romeo Montegue fights Paris Escalus.
The Prince broke up the fight. Montegues and Capulets are not allowed to fight. It is illegal, punishable by death.
Romeo was banned because he killed Tybalt.
Romeo gets banned from Verona in Act 3 of William Shakespeare's play "Romeo and Juliet" after he avenges Mercutio's death by killing Tybalt. Prince Escalus banishes Romeo for his actions, declaring that if he is found in Verona he will be immediately put to death.
Act 2, scene 3
Benvolio (in Act 1), Mercutio and Romeo (in Act 3).
in the final scene, both romeo and Juliet die.
Act 4 Scene 3
because she wants to get intimate with romeo
the dog.