In 2018, the ownership of the great granite was transferred in its entirety to Dun Laoghaire Rathdown County Council who now operate and manage the harbour. Prior to that, the harbour was operated by The Dun Laoghaire Harbour Company, a state company, dissolved in 2018 under the Ports Act.
1817 - Construction of the East Pier to a design by John Rennie began in 1817 with Earl Whitworth Lord Lieutenant of Ireland laying the first stone.
1820 - Rennie had concerns a single pier would be subject to silting, and by 1820 gained support for the construction of the West pier to begin shortly afterwards. When King George IV left Ireland from the harbour in 1820, Dunleary was renamed Kingstown, a name that was to remain in use for nearly 100 years. The harbour was named the Royal Harbour of George the Fourth which seems not to have remained for so long.