Navan Fort ( ; ) is an ancient ceremonial monument near Armagh, Northern Ireland. According to tradition it was one of the great royal sites of pre-Christian Gaelic Ireland and the capital of the Ulaidh. It is a large circular hilltop enclosure—marked by a bank and ditch—inside which is a circular mound and the remains of a ring barrow. Archeological investigations show that there were once buildings on the site, including a huge roundhouse-like structure that has been likened to a temple. In a ritual act, this timber structure was filled with stones, deliberately burnt down and then covered with earth to create the mound which stands today. It is believed that Navan was a pagan ceremonial site and was regarded as a sacred space. It features prominently in Irish mythology, especially in the tales of the Ulster Cycle. According to the Oxford Dictionary of Celtic Mythology, "the [Eamhain Mhacha] of myth and legend is a far grander and mysterious place than archeological excavation supports". Navan Fort is the heart of the larger 'Navan complex', which also includes the ancient sites of Haughey's Fort (an earlier hilltop enclosure), the King's Stables (a manmade ritual pool) and Loughnashade (a natural lake that has yielded votive offerings). The name Eamhain Mhacha has been interpreted as "Macha's twins" or "Macha's brooch", referring to a local goddess. 'Navan' is an anglicisation of the Irish An Eamhain. Name The Irish name of Navan Fort is Eamhain Mhacha, from Old Irish: Emain Macha. The second element refers to the goddess Macha, for whom nearby Armagh (Ard Mhacha) is also named. However, the overall meaning of the name is unclear. It has been interpreted as "Macha's twins" or "Macha's pair" (possibly referring to the two features on the hilltop, or to Navan Fort and another nearby monument), or as "Macha's brooch" (possibly referring to the shape of the monument). There are tales that try to explain how the name came about. In the second century AD, Greek geographer Ptolemy noted a place called Isamnion somewhere in southeastern Ulster. Some scholars believe this refers to Emain, and Gregory Toner has derived it from Proto-Celtic *isa-mon ("holy mound"). Others believe it refers to a place on the coast. Eamhain Mhacha, and its short form An Eamhain, was anglicised as 'Owenmagh', 'Nawan' and eventually 'Navan'. Description Navan Fort, sometimes called Navan Rath, is a State Care Historic Monument in the