Hillforts in Britain refers to the various hillforts within the island of Great Britain. Although the earliest such constructs fitting this description come from the Neolithic British Isles, with a few also dating to later Bronze Age Britain, British hillforts were primarily constructed during the British Iron Age. Some of these were apparently abandoned in the southern areas that were a part of Roman Britain, although at the same time, those areas of northern Britain that remained free from Roman occupation saw an increase in their construction. Some hillforts were reused in the Early Middle Ages, and in some rarer cases, into the Later Medieval period as well. By the early modern period, these had essentially all been abandoned, with many being excavated by archaeologists in the nineteenth century onward.
There are around 3,300 structures that can be classed as hillforts or similar "defended enclosures" within Britain.[1] Most of these are clustered in certain regions: south and south-west England, the west coast of Wales and Scotland, the Welsh Marches and the Scottish border hills.[2][3] British hillforts varied in size, with the majority covering an area of less than 1 hectare (2.5 acres), but with most others ranging from this up to around 12 hectares (30 acres) in size. In certain rare cases, they were bigger, with a few examples being over 80 hectares (200 acres) in size.[4]
Various archaeologists operating in Britain have criticised the use of the term "hillfort" both because of its perceived connection to fortifications and warfare and because not all such sites were actually located on hills. Leslie Alcock believed that the term "enclosed places" was more accurate,[2] whilst J. Forde-Johnston commented on his preference for "defensive enclosures".[5]