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https://stairnaheireann.net/2016/07/10/988-the-norse-king-gluniairn-recognises-mael-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-ci/
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