It was not a capital with its own government.
Known. Haughey's Fort was a large centre of craft, trade, and ceremony.
The fort stands on a hill in County Armagh, Northern Ireland. It dates to about 1200 BC, in the Late Bronze Age, nearly 3,000 years ago. A new study found signs of more than 200 timber buildings inside the fort, including some unusually large round ones. Earthworks once enclosed about 109 hectares. A fenced avenue about 87 metres long led down to a made pool called the King's Stables. Earlier digs there found moulds for leaf-shaped bronze swords, animal bones, and a piece of a human skull placed in the pool.
The page does not say what is still argued.
https://www.ancient-origins.net/news-history-archaeology/bronze-age-hill-fort-armagh-00103030