Ruined during the slighting, the great tower is notable for its huge corner turrets, essentially hugely exaggerated Norman pilaster buttresses.[10] Its walls are 5 metres (16 feet) thick, and the towers 30 metres (98 feet) high.[11] Although Kenilworth's great tower is larger, it is similar to that of Brandon Castle near Coventry; both were built by the local Clinton family in the 1120s.[12] The tower can be termed a hall keep, as it is longer than it is wide.[5] The lowest floor is filled with earth, possibly taken from the earlier motte that may have been present on the site, and is further protected by a sloping stone plinth around the base.[10] The tall Tudor windows at the top of the tower date from the 1570s.[13]