The great tower of Dudley Castle, in the West Midlands, is re-examined in order to situate it within the evolutionary sequence of great tower designs. In so doing, it is argued that the origins of its plan are to be found in the works of the early to mid-thirteenth century, and that the tower itself was probably begun during the 1260s. Furthermore, it is asserted that the tower represents a milestone in the thinking that underpinned the redevelopment of castle mottes, and that it is to be seen as the prime connection between the circle-based plans that dominated motte redevelopments in the twelfth and thirteenth centuries, and later developments that led, ultimately, to the radically different, but architecturally successful scheme adopted by the builder of the donjon of Warkworth Castle in Northumberland.