Which character first persuades Romeo to attend the masquerade ball?

You might think it was Benvolio but it wasn't. Romeo wanted to go to the party to see Rosaline. As soon as he knew she was invited, he wanted to go. He couldn't care less about Benvolio's advice to look at the other girls at the party. "I'll go along, no such sight to be shown, but to rejoice in splendour of my own."