Emain Macha or Emuin Macha (Old Irish, pronounced ), Eamhain Mhacha (Modern Irish, pronounced ), sometimes Latinised/Anglicised as Emania and known in English as Navan Fort, is an ancient monument in County Armagh, Northern Ireland. Although called a "fort", it is considered more likely to have been a ritual or ceremonial site. It appears to have been abandoned by the first century AD. It is also a significant site in Irish mythology, particularly the Ulster Cycle. Navan Fort is a State Care Historic Monument in the townland of Navan, in Armagh City and District Council area, at grid ref: area of H847 452.
Archaeological excavations have revealed that the construction of the 40 metre mound dates to 95 BC (securely dated by dendrochronology). A circular structure consisting of four concentric rings of posts around a central oak trunk was built, its entrance facing west (prehistoric houses invariably face east, towards the sunrise). The floor of the building was covered with stones arranged in radial segments, and the whole edifice was deliberately burnt down before being covered in a mound of earth and turf (there is archaeological evidence for similar repeated construction and immolation of Temuir and the Dún Ailinne). The bank and ditch that surround the hilltop were built at the same time.
No secure date can be assigned to the ring-barrow, but excavations and geophysical surveys have revealed the remains of a figure–of–eight shaped wooden building underneath. The larger ring of the figure–of–eight was 30 metres (100 ft) in diameter, the smaller about 20 metres (65 ft). The building had been rebuilt twice. Similar, slightly smaller structures, each with a central hearth, were found under the 40 metre mound. Artifacts found in these layers show they were inhabited in the late Bronze Age and early Iron Age (approximately 600 to at least 250 BC). Perhaps the most unusual item found in these layers was the skull of a Barbary Macaque.
An earlier Bronze Age structure, a circular ditch surrounding the mound, 45 metres (150 ft) in diameter, 5 metres (16 ft) wide and 1 metre (3 ft) deep, was also found, and flint tools and fragments of pottery show activity at the site in the Neolithic (ca. 4000 to 2500 BC).
The name Emain Macha is variously explained as "Macha's neck-brooch", after Macha marked out the boundaries of the site with her brooch, and "Macha's twins", after Macha gave birth to twins after being forced to compete in a chariot-race. The Annals of the Four Masters record that it was abandoned after it was burned by the Three Collas in 331 AD, after they had defeated Fergus Foga, king of Ulster, in battle at Achadh Leithdheirg
Irish heavy metal band Waylander has a song called "Emain Macha" on their 1998 Century Media album Reawakening Pride Once Lost.
In the MMORPG Dark Age of Camelot, "Emain Macha" is the name of a frontier zone, in which the realm of Hibernia must protect in order to safeguard their realm and relics.
Emain Macha also appears in the MMORPG Mabinogi, which is a Korean computer game. The fortress-city of Emain Macha is a lakeside medium town, and is the residence of the Duke of Emain Macha. The city is also the headquarters of the Knightly order of Paladins.