Calvin Montague is a level 5 quest giver located by the exit from Deathknell in the Forsaken starting zone of Tirisfal Glades. Upon starting  , he will attack you, claiming that he owes you nothing.
He also ends:
- You should check it out... you do and I'll pay you well.
- You want money? I don't owe you any money. Letter? What letter? Oh, you wanna fight then? All right, mate... let's do this! Owe you any money…
- His surname Montague follows along with the Bankers in the Undercity, taking names from Shakespeare's works.