Hill fort

A hill fort is a type of fortified refuge or defended settlement, located to exploit a rise in elevation for defensive advantage. They are typically European and of the Bronze and Iron Ages. The fortification usually follows the contours of the hill, consisting of one or more lines of earthworks, with stockades or defensive walls, and external ditches.

European Bronze Age and Iron Age Hill Forts
Some European hill forts originate in the late Neolithic period, but they are most common during later periods:
 * Urnfield culture (c. 1300 BC - 750 BC) Bronze Age
 * Hallstatt culture (c. 1200 BC - 500 BC) late Bronze Age to early Iron Age
 * La Tene culture (c. 600 BC - 50 AD) late Iron Age

Hill forts were in use in many Celtic areas of central and western Europe until the Roman conquest. Julius Caesar described the large late Iron Age hill forts he encountered during his campaigns in Gaul as oppida. By this time the larger ones had become more like cities than fortresses and many were assimilated as Roman towns.

Beyond the simple definition of hill fort, there is a wide variation in types and periods from the Bronze Age to the Middle Ages. Here are some considerations of general appearance and topology, which can be assessed without archaeological excavation:
 * Location
 * Hilltop Contour: the classic hill fort; an inland location with a hilltop defensive position surrounded by artificial ramparts or steep natural slopes. Examples: Brent Knoll, Mount Ipf.
 * Inland Promontory: an inland defensive position on a ridge or spur with steep slopes on 2 or 3 sides, and artificial ramparts on the level approaches. Example: Lambert's Castle.
 * Interfluvial: a promontory above the confluence of two rivers, or in the bend of a meander. Example: Kelheim.
 * Lowland: an inland location without special defensive advantages (except perhaps marshes), but surrounded by artificial ramparts; typical of later settled oppida. Examples: Maiden Castle, Stonea Camp.
 * Sea Cliff: a semi-circular crescent of ramparts backing on to a straight sea cliff; common on rocky Atlantic coasts, such as Ireland. Examples: Daw's Castle, Dinas Dinlle, Dún Aengus.
 * Sea Promontory: a linear earthwork across a narrow neck of land leading to a peninsula with steep cliffs to the sea on three sides; common on indented Atlantic coasts, such as Ireland, Cornwall, Brittany and west Wales. Examples: The Rumps, Huelgoat.
 * Sloping Enclosure: smaller earthwork on gently sloping hillsides; not significant defensive position. Examples: Trendle Ring, Plainsfield Camp.
 * Area
 * > 20 ha: very large enclosures, too diffuse to defend, probably used for domesticated animals.
 * 1 - 20 ha: defended areas large enough to support permanent tribal settlement.
 * < 1 ha: small enclosures, more likely to be individual farmsteads or animal pens.
 * Ramparts, walls and ditches
 * Univallate: a single circuit of ramparts for enclosure and defence. Example: Solsbury Hill.
 * Multivallate: more than one layer of defensive earthworks, outer works might not be complete circuits, but defend the weakest approaches; typically the inner circuit is original, with outer circuits added later. Example: Cadbury Castle.
 * Entrances
 * Simple opening: might indicate an enclosure, rather than a defended position; sometimes the main ramparts may turn inward or outward, and be widened and heightened to control the entrance. Example: Dowsborough.
 * Linear holloway: straight parallel pair of ramparts dominating the entrance; projecting either inward, outward, or occasionally overlapped along the main rampart. Example: Norton Camp.
 * Complex: multiple overlapping outer works; staggered or interleaved multivallate ramparts; zig-zag entrance way, sling platforms and well planned lines of fire. Examples: Maiden Castle.

Some forts were also settlements, while others were only occupied seasonally, or in times of strife. Archaeological excavation reveals more about the dates of occupation and modes of use. Typical features for excavation include:
 * Ramparts and ditches
 * Original depths and profiles of ditches.
 * Rampart construction: murus gallicus, pfostenschlitzmauer.
 * Guardhouses and defended entrances.
 * Settlement and occupation
 * Raised platforms, roundhouses, longhouses.
 * Post holes for rectangular granary huts.
 * Pits for food storage, souterrains, fogous.
 * Pottery
 * Coins, jewellery and hoards.
 * Temples and peacetime burials
 * Platforms and temple foundations.
 * Graves and offerings
 * Warfare
 * Weapons: sling-shot, shields, armour, swords, axes, spears, arrows.
 * Sieges and conquest: ballista bolts, ash layers, vitrified stones, burnt post holes.
 * Wartime burials: typically outside the ramparts:
 * Contemporary individual burials by local inhabitants.
 * Massed grave pits dug by a conquering army.

Hill forts were frequently occupied by conquering armies, but on other occasions the forts were destroyed, the local people forcibly evicted, and the forts left derelict. For example, Solsbury Hill was sacked and deserted during the Belgic invasions of southern Britain in the 1st century BC. Abandoned forts were sometimes reoccupied and refortified under renewed threat of foreign invasion, such as the Dukes' Wars in Lithuania, and the successive invasions of Britain by Romans, Saxons and Vikings.

Scandinavia and Russia
In Scandinavia and northern Russia, hill forts are fortifications from the Iron Age which may have had several functions. They are usually located on the crests of hills and mountains making use of precipices and marshes which worked as natural defenses. The crests' more accessible parts were defended with walls of stone and outer walls in the slopes beneath are common. Round and closed, so called, ring forts are common even on flat ground. The walls often have remaining parts of stone, which were probably the support of pales. They often have well delineated gateways, the gates of which were probably of wood. Hill forts with strong walls are often located beside old trading routes and have an offensive character, whereas others are reclusive and were weakly fortified, probably only for hiding during raids.

Many forts, located centrally in densely populated areas, were permanently settled strongholds and can show traces of settlements both inside and outside. Older place names containing the element sten/stein were usually hill forts.

In Sweden, there are 1100 known hill forts with a strong concentration on the northern west coast and in eastern Svealand. Only in Södermanland, there are 300, in Uppland 150, Östergötland 130 and Bohuslän and Gotland 90-100 each.

In Gotland, ring forts can be from the Pre-Roman Iron Age, but findings from the period 200 AD- 600 AD dominate. Many were still in use during the Middle Ages.

The Finnish word for hill fort is linnavuori (plural linnavuoret), from linna (castle) and vuori (mountain). Finnish castles were usually constructed of wood.

Examples

 * Tingstäde Träsk
 * Lyubsha
 * Alaborg
 * Gnezdovo
 * Old Castle of Lieto

Lithuania and Estonia
The Lithuanian word for hill fort is piliakalnis (plural piliakalniai), from pilis (=castle) and kalnas (=mountain, hill).

Lithuania has hill forts dating from the Bronze Age in the 1st millennium BC. The earliest examples in present day Lithuania are found in the east of the country. Most forts were built or refortified in the 5th-15th centuries, when they were used in the Dukes' Wars, and against the invasion of Teutonic Knights from the west. Most forts were located on the banks of a river, or where two rivers met. The fortifications were typically wooden, although some had stone or brick walls. The hill was often sculpted for defence, with the top flattened for occupation, and natural slopes made steeper for defence.



During the early years of Grand Duchy of Lithuania piliakalniai played a major role in fights with the Livonian Order and Teutonic Knights. During that time the number of piliakalniai decreased, but their fortifications became stronger. Two main defense lines developed: one along the Neman River (against the Teutonic Order) and another along the border with Livonia. Two other lines started to form, but did not fully develop. One was protecting Vilnius, the capital, and another one at Samogitia, was a major target for both orders since only this slice of land separated them.

Most of the castles were wooden and were quite easy to burn. As firearms and cannons developed, piliakalnis and their castles became ineffective. Also, the Livonian Order was defeated in 1236 in the Battle of Saule. The Teutonic Knights suffered a major defeat in 1410 in the Battle of Grunwald and did not pose any further major threat.

According to the Lietuvos piliakalnių atlasas (English: Atlas of Piliakalniai in Lithuania), there were 826 piliakalniai in Lithuania. Some researchers present a total number of 840 known piliakalnis in 2007; the number is likely to increase as even more of them are discovered every year. Most piliakalniai are located near rivers and are endangered by erosion: many have partly collapsed as the flooded river has washed out the base of the hill. Now around 80 percent of piliakalniai are covered by forests and are hardly accessible to visitors.

Estonia


The Estonian word for hill fort is linnamägi (plural linnamäed), meaning hillfort or hillburgh. There are several hundred hill forts or presumed ancient hill fort sites all over Estonia. Some of them - like Toompea in Tallinn or Toomemägi in Tartu are governance centres used since ancient times up until today. Some others, like Varbola are historical sites nowadays.

Most likely the Estonian hill forts were in pre-Christian times administrative, economic and military centres of Estonian tribes. Although some of them were probably used only during times of crisis and stood empty in peacetime (for example Soontagana in Koonga parish, Pärnu county.

Examples

 * Varbola (Estonia)
 * Kernavė, (Lithuania, a World Heritage Site)

Britain
Hill forts in Britain are known from the Bronze Age, but the great period of hill fort construction was during the Iron Age, between 200 BC and the Roman conquest of Britain in 43 AD. The Romans occupied some forts, such as the military garrison at Hod Hill, and the temple at Brean Down, but others were destroyed and abandoned. Mass graves at Cadbury Castle indicate it was involved in the Boudiccan revolt in 60-61 AD. Many of the place names of these sites bear the suffix "-bury", meaning fort. Some are called Cytiau (cytiau'r Gwyddelod, the huts of the Irish). Maiden Castle in Dorset is the largest hill fort in England. Where Roman influence was less strong, such as uninvaded Ireland and unsubdued northern Scotland, hill forts were still built and used for several more centuries.



There are over 2000 Iron Age hillforts known in Britain. Some forts were reoccupied following the end of Roman rule, to defend against pirate raids, and the Anglo-Saxon invasions. The cemetery outside Poundbury Hill contains east-facing Christian burials of the 4th century. The Wansdyke was a new linear earthwork connected to the existing hill fort at Maes Knoll, which defined the Celtic-Saxon border in south-west England during the period 577-652 AD.

Some hill forts were reoccupied by the Anglo-Saxons during the period of Viking raids. King Alfred established a network of coastal hill forts and lookout posts in Wessex, linked by a Herepath, or military road, which enabled his armies to cover Viking movements at sea. For example, see Daw's Castle and Battle of Cynwit.

After careful archaeological excavation, it has been found that many so-called hill forts were just used to pen in cattle, horses, or other domesticated animals. The large sprawling examples at Bindon Hill and Bathampton Down are more than 50 acres (20 ha). Even those that were defensive settlements in the Iron Age, were sometimes used for coralling animals in later periods. For example, see Coney's Castle, Dolebury Warren and Pilsdon Pen.

Examples

 * see List of hill forts in England
 * see List of hill forts in Scotland
 * see List of hill forts in Wales

Ireland
A Bronze-age and Iron-age type of defended settlement from prehistoric Ireland is the hill-fort: a large circular type between 1 and 40 acres (more usually 5-10acres) enclosed by a stone wall or earthen rampart or both. These hill-forts are strategically located on top of large stand alone hills if possible to ensure maximum defence against raids from neighbouring enemies. These would have been tribally important centres where the Chief or King of the area would live with his extended family and support themselves by farming and renting cattle to their underlings.

There are around 40 hill-forts known in Ireland: about 12 are multivallate forts, as distinguished by multiple ramparts, or a large counterscarp (outer bank). The imposing example at Mooghaun is defended by multiple stone walls. One must be careful to not confuse a hill-fort with a 'ringfort' a medieval settlement a common archaeological feature across the whole island of Ireland, over 40,000 examples are known.

Some hill-forts have cairns inside their boundaries and there are many speculations about this phenomena, the theories range from being a strange cult religion to just co-incidence the same kind of area as they both like (hill tops with commanding views of the local viscinity), the excavation at Freestone Hill in Co. Kilkenny has shown that there was indeed a ditch cut out around the cairn, evidence that they had respect for the feature no matter what they believed about it.

Examples

 * Lyles Hill, Co. Antrim
 * Maghera Temple, Co. Cavan
 * Mooghaun, Co. Clare (multivallate)
 * Grianán of Aileach, Co. Donegal (multivallate)
 * Dunbeg, Co. Down
 * Downpatrick, Co. Down
 * Caherconree, Co. Kerry
 * Dún Ailinne, Co. Kildare
 * Dunmurray Hill, Co. Kildare
 * Freestone Hill, Co. Kilkenny
 * Spa Hill, Co. Kilkenny
 * Rath Meave at Tara, Co. Meath
 * Clogher, Co. Tyrone
 * Emain Macha, Co. Armagh
 * Brusselstown Ring, Co. Wicklow
 * Rathgall, Co. Wicklow (multivallate)

Portugal and Spain
In Galicia, Asturias, Cantabria and Northern Portugal a castro is a fortified pre-Roman Iron Age Celtic village, usually located on a hill or some naturally easy defendable place. The larger castros are called citanias or cividades (English: cities).

Castros were located on hilltops, which allowed tactical control over the surrounding countryside and provided natural defenses. They invariably had a spring or small creek to provide water; some even had large reservoirs to use during sieges. Typically, a castro has a triple loose stone and earth wall, which complements the natural defenses of the hill. The houses inside are about 3.5–5 m long. Most of the houses are circular in shape, although some are rectangular and they are made out of stone with thatch roofs that rest on a wood column in the centre of the building. Their streets are somewhat regular, suggesting some form of central organization. Castros vary in diameter from dozens of metres to several hundred.


 * Castro de Coaña, Asturias, Spain

Castros were mostly places of refuge during the frequent Celtic tribal wars, although many, including all the citanias, were continuously inhabited, as well.

Many castros were already inhabited during the Bronze Age, long before the Celtic invasions, and it is thought that the Iberian culture of these settlements largely survived the Celtic influx, with which it blended, adopting the Celtic Language as a lingua franca with their commercial contacts along the Atlantic Coast.

Many of the megaliths from the Bronze Age such as menhirs and dolmens, which are frequently located near the castros, also predate the Celts in Portugal, Asturias and Galicia as well as in Atlantic France, Britain and Ireland. These megaliths were probably reused in syncretic rituals by the Celtic Druids.

Although many castros were destroyed by the Romans, others were expanded into proper cities.

The Celtiberian people occupied an inland region in central northern Spain, straddling the upper valleys of the Ebro, Douro and Tajo. They built hillforts, fortified hilltop towns and oppida, including Numantia.

Examples

 * Citânia de Sanfins, Paços de Ferreira, Portugal
 * Citânia de Briteiros, Portugal
 * Castro de Ovil, Portugal
 * Castro Laboreiro, Portugal
 * Castro do Vieito, Portugal
 * Castro Verde, Alentejo, Portugal
 * Castro de Baroña, Galicia, Spain
 * Los Cogotas, Ávila, Spain
 * Castro de Ulaca, Spain
 * La Mesa De Miranda, Spain
 * Numantia, Spain

France
The Gaulish hero Vercingetorix was famously besieged by Julius Caesar in the hill fort of Alesia. The predominant form of rampart construction was murus gallicus.

Examples

 * Alesia
 * Bibracte (Mont Beuvray)
 * Mont St. Odile (Mur Païen)
 * Le Camp d'Artus, Huelgoat

Central Europe


The Hallstatt and La Tene cultures originated in what is now southern Germany, Switzerland, Austria, and the Czech Republic. However, hill forts were built also in Poland and further east, till the Middle Ages.

The predominant form of rampart construction is pfostenschlitzmauer, or Kelheim-style. The murus gallicus defenses at Manching were later rebuilt and extended in the pfostenschlitzmauer style.

Examples

 * Heuneburg, Württemberg, Germany
 * Mount Ipf, Baden-Württemberg, Germany
 * Kelheim, Bavaria, Germany
 * Manching, Bavaria, Germany
 * Staré Hradisko, Moravia, Czech Republic
 * Závist, Bohemia, Czech Republic
 * Třísov, Bohemia, Czech Republic
 * Giecz, western Poland
 * Bielsko-Biała, southern Poland