He is described by the witches as "lesser than Macbeth, and greater"
[DOC] [TLE] MACBETH, Act 1 Scene 3 - Shakespeare Navigators [PAR] I'll give thee a wind: Folklore said that witches could make bad weather for their ... 
23 Shall he dwindle, peak and pine: ... 65 Lesser than Macbeth, and greater.