Hill of Tara in the context of "Office of Public Works"

High King of Ireland (Irish: Ardrí na hÉireann [ˈaːɾˠd̪ˠˌɾˠiː n̪ˠə ˈheːɾʲən̪ˠ]) was a royal title in Gaelic Ireland held by those who had, or who are claimed to have had, lordship over all of Ireland. The title was held by historical kings and was also assigned anachronously or to legendary figures.

Medieval and early modern Irish literature portrays an almost unbroken line of High Kings, ruling from the Hill of Tara over a hierarchy of lesser kings, stretching back thousands of years. Modern historians believe this scheme was crafted in the 8th century from the various genealogical traditions of powerful dynasties, and intended to justify their status by projecting it far into the past. John T. Koch explains: "Although the kingship of Tara was a special kingship whose occupants had aspirations towards supremacy among the kings of Ireland, in political terms it is unlikely that any king had sufficient authority to dominate the whole island before the 9th century".

The Tara Brooch is an Irish Celtic brooch, dated to the late 7th or early 8th century. It is of the pseudo-penannular type (with a fully closed head or hoop), and made from bronze, silver and gold. Its head consists of an intricately decorated circular ring, and overall, its front and reverse sides are equally decorated; each holds around 50 inserted cast panels packed with filigree. The brooch was constructed from numerous individually made pieces; all of the borders and terminals contain multiple panels holding multi-coloured studs, interlace patterns, filigree, and Celtic spirals. It is widely considered the most complex and ornate of its kind, and would have been commissioned as a fastener for the cloak of a high-ranking cleric or as ceremonial insignia of high office for a High King of Ireland.

The Tara Brooch was hidden on the east coast of Ireland sometime during the 11th or 12th century, most likely to protect it from Viking or Norman invaders. It was rediscovered around 1850, but the exact find-spot and circumstances are unclear. Despite its title, it was not found at the Hill of Tara but on or near the beach around Bettystown on the coast of County Meath. The name by which it became known was chosen by its first commercial owner, the Dublin-based jeweller George Waterhouse, as a marketing ploy for selling copies during the height of the 19th century Celtic Revival. For this reason, many art historians describe it with inverted commas as the "Tara" brooch.

Dunseverick (from Irish Dún Sobhairce 'Sobhairce's fort') is a hamlet near the Giant's Causeway in County Antrim, Northern Ireland. The name is also the alias for the townland of Feigh. It is most notable for Dunseverick Castle.

One of the five great highways, or slighe of ancient Ireland, Slige Midluachra, had its terminal point at Dunseverick, running from here to Emain Macha and further to royal Tara and the fording point on the Liffey at what is now Dublin.

The Fál (Irish: [fˠaːlˠ]) or Lia Fáil (Irish: [ˌl̠ʲiə ˈfˠaːlʲ]; "Stone of Fál") is a stone at the Inauguration Mound (Irish: an Forrad) on the Hill of Tara in County Meath, Ireland, which served as the coronation stone for the King of Tara and hence High King of Ireland. It is also known as the Stone of Destiny or Speaking Stone. According to legend, all of the kings of Ireland were crowned on the stone up to Muirchertach mac Ercae, c. 500 AD.

The term Kingship of Tara (/ˈtærə/) was a title of authority in ancient Ireland; the title is closely associated with the archaeological complex at the Hill of Tara. The position was considered to be of eminent authority in medieval Irish literature and Irish mythology, although national kingship was never a historical reality in early Ireland. The term also represented a prehistoric and mythical ideal of sacred kingship in Ireland. Holding the title King of Tara invested the incumbent with a powerful status. Many Irish High Kings were simultaneously Kings of Tara. The title emerged in the ninth and tenth centuries. In later times, actual claimants to this title used their position to promote themselves in status and fact to the High Kingship. Prior to this, various branches of the Uí Néill dynasty appear to have used it to denote overlordship of their kindred and realms. It was associated with Feis Temro (Feast of Tara), a pagan inauguration rite.

The titles King of Tara and High King of Ireland were distinct and unrelated for much of history.

The royal sites of Ireland were the seats of the Gaelic kings of Ireland. Medieval sources describe them as the ceremonial capitals of various Irish kingdoms, where kingly inaugurations, assemblies and athletic games were held. Archaeological investigations show that many royal sites were culturally significant for thousands of years before recorded history, and they often include ancient monuments such as Neolithic burial mounds, standing stones, cairns and enclosures.

Each Irish kingdom is thought to have had its own royal site, but six sites are considered to be the most important. These are Tara (Irish: Teamhair), seat of the Kings of Meath and the High King, along with the provincial capitals: Navan Fort (Eamhain Macha) for Ulster; Rathcroghan (Cruachan) for Connacht; Knockaulin (Dún Ailinne) for Leinster; and Cashel (Caiseal) for Munster. Uisneach represented the union of the provinces and may have served as a meeting place for the kings. These major sites, excluding Navan Fort (in Northern Ireland), have been listed as a potential UNESCO World Heritage Site.

Conaire Mór (the great), son of Eterscél, was, according to mediaeval Irish legend and historical tradition, a High King of Ireland sometime during the 1st century BC or 1st century AD. His mother was Mess Búachalla, who was either the daughter of Eochu Feidlech and Étaín, or of Eochu Airem and his daughter by Étaín. In the Old Irish saga Togail Bruidne Dá Derga he is conceived when his mother is visited by Nemglan who flies in her skylight in the form of a bird, and is brought up as Eterscél's son.

According to the Lebor Gabála Érenn, he took power after killing his predecessor, and his father's killer, Nuadu Necht. In Togail Bruidne Dá Derga he succeeds Eterscél directly. When Eterscél dies, a bull-feast is held. A bull is killed, a man eats his fill of its meat and drinks its broth, and sleeps as incantations are chanted over him. Whoever this man sees in his sleep will be the new king. He sees a naked man coming along the road to Tara with a stone in his sling. The young Conaire, meanwhile, is hunting birds in his chariot. He chases them into the sea, where they become armed men, announce themselves as Conaire's father's bird troop, and inform him that it is forbidden for him to hunt birds. The leader of the bird troop is called Nemglan and he tells Conaire to go naked to Tara, where he will be made king, and places several geasa (taboos) on his reign. Among other things, he may not be preceded by three red men into the house of a red man. As he approaches Tara he is met by three kings carrying clothes for him, and when he arrives he is made king.

Medieval Irish historical tradition held that Ireland had a High King (Ard Rí) based at Tara since ancient times, and compilations like the 11th-century Lebor Gabála Érenn, followed by Early Modern works like the Annals of the Four Masters and Foras Feasa ar Éirinn, purported to trace the line of High Kings. John T. Koch explains: "Although the kingship of Tara was a special kingship whose occupants had aspirations towards supremacy among the kings of Ireland, in political terms it is unlikely that any king had sufficient authority to dominate the whole island before the 9th century". Máel Sechnaill I is often considered the first historical High King, although he faced some opposition. Applying the title to earlier kings is considered anachronistic, while kings from before the 5th century are generally considered legendary. The traditional list of High Kings is thus a mixture of historical facts and legend.

The annals describe some later High Kings as rígh Érenn co fressabra ("Kings of Ireland with opposition"), which is a reference to the instability of the kingship of Tara from the death of Máel Sechnaill mac Domnaill in 1022. He had been overthrown by Brian Boru in 1002, and restored in 1014 following Brian's death, but Brian's example was followed by many other dynasties in the century following 1022. The High Kingship was effectively ended in the 1170s after the Anglo-Norman invasion, its last holder being Ruaidrí Ua Conchobair.