Answer: He was prevented from delivering Friar Laurence’s letter.
Explanation:
One of the most famous Shakespeare's plays is a story about the two lovers which try to find a way to be together. They cannot get married because of their warring families.
Friar Laurence, however, decides to help them by making a strange potion. Romeo's girlfriend drinks it, and it makes her appear dead. Friar John is supposed to deliver a letter to Romeo, in which it is stated that his girlfriend is alive. However, he is unable to do so, because there is a plague outbreak in Mantua, and he is quarantined. This leads to a catastrophe, as Romeo assumes that she is dead, and kills himself.
