Who is friar lawrence and when does he show up in the story

Friar Lawrence is basically the father of the church. He secretly gives Juliet a bottle of (something, i cant remember exactly what it's called) that will make her heart stop beating for a certain amount of time so it looks as if she's dead. I don't know exactly where he first shows up in the story though. Sorry.

Friar Laurence is presented as a holy man who is trusted and respected by the other characters.