988 – The Norse King Glúniairn recognises Máel Sechnaill mac Domnaill, High King of Ireland, and agrees to pay taxes and accept Brehon Law; the event is considered to be the founding of the city of Dublin. — Stair na hÉireann – History of Ireland

The earliest reference to Dublin is sometimes said to be found in the writings of Claudius Ptolemaeus (Ptolemy), the Egyptian-Greek astronomer and cartographer, around the year 140, who refers to a settlement called Eblana. This would seem to give Dublin a just claim to nearly two thousand years of antiquity, as the settlement must have […]

via 988 – The Norse King Glúniairn recognises Máel Sechnaill mac Domnaill, High King of Ireland, and agrees to pay taxes and accept Brehon Law; the event is considered to be the founding of the city of Dublin. — Stair na hÉireann – History of Ireland