He's the brutish character who says, "This island's mine, by Sycorax my mother, which thou tak'st from me"
[DOC] [TLE] Caliban's Power Struggles | Summer Shakespeare at New Paltz [PAR] Jun 21, 2013 ... By the time we are introduced to the characters, the relationship ... got by the 
devil himself (1.2.323) and a thing most brutish (1.2.360).