Silvius is a young shepherd, desperately in love with Phoebe and unwilling to believe that the aged can possibly understand his torment.
He woos Phoebe poetically, which is unfortunate as she has no taste for metaphor. He is willing to do all she commands, including deliver a letter that he presumes to be angrily written to an insulting young man. He is appalled to discover that Phoebe has fallen for said young man. He can catechize what love is when required.