In Verona, Sampson and Gregory (Capulet servants) complain that they will not put up with insults from the Montague family. Abram and Balthasar (Montague servants) appear and the four start quarreling. Benvolio (Lord Montague's nephew) appears and tries to break up the quarrel, but Tybalt (Lady Capulet's nephew) appears and picks a fight with Benvolio. At length, officers try to break up the fight, even while Lord Capulet and Lord Montague begin to fight one another. The Prince of Verona (Escalus) appears and stops the fighting, proclaiming sentences of death to any that renew the fighting.
At Montague's house, he, his wife, and Benvolio discuss how melancholy Romeo (Montague's only son) has been lately. Benvolio vows to find out why. Speaking with Romeo, Benvolio finds Romeo is in love with a woman who has sworn to stay chaste (Rosaline). Benvolio suggests pursuing other women, but Romeo refuses. Separately, Paris (a kinsman of the Prince of Verona) talks to Lord Capulet about wooing his daughter Juliet for marriage. Capulet responds that she is too young (nearly 14 years old) and must wait two years to marry, and then only to the man whom she chooses.
Still, Capulet invites Paris to a party in the evening. Capulet's servant is sent to invite guests, but he can't read the list so he entreats Romeo to do so. Upon hearing of the party, Benvolio convinces Romeo to attend and compare his unattainable love Rosaline to more beautiful women to get his mind off Rosaline. At Capulet's house, Lady Capulet speaks to Juliet about her feelings for marrying Paris while Juliet's Nurse listens on, telling stories of Juliet's childhood. Juliet, although hesitant, promises to be courteous. Masked, Romeo, Mercutio, and Benvolio head to the Capulet party. Romeo is still depressed, saying he dreamt a fearful dream of an untimely death that will result because of the evening's events, but Benvolio just makes fun of him.
At Capulet's house, the Montagues attend the party (in masks), Romeo spies Juliet, and he falls in love with her. Tybalt sees Romeo and takes up arms, but Lord Capulet attempts to calm him, though Tybalt vows to revenge Romeo's intrusion the next day. Juliet, too, falls for Romeo, but falls into despair when her Nurse informs her Romeo is a Montague, as does Romeo when he learns Juliet is a Capulet.
While leaving the party, Romeo hides in the orchard while Mercutio and Benvolio call for him to come out of hiding and go home with them; yet he will not. After they leave, Romeo appears and speaks to Juliet under her window, by and by they swear their love to one another. Juliet tells Romeo she'll send a messenger to him the next day to learn the details of their wedding. Having stayed up all night, Romeo visits Friar Lawrence's cell and tells him of this new love for Juliet. Although Lawrence is critical at first, Romeo eventually convinces him to marry them.
