What is the main purpose of prince in Act 1 scene Romeo and Juliet?

The main purpose of the prince in Act 1, Scene 1 of Romeo and Juliet is to introduce the setting, establish the ongoing conflict between the Montagues and Capulets, and to deliver a sentence and warning upon the feuding families. The prince's presence in the scene highlights the significance and severity of the conflict between the two families, as he is the highest-ranking authority figure in the play and takes a direct interest in resolving the feud.