The Reign of Niall: 1056-1081
When Niall O'Brien took the reigns of the throne of Ireland, the Anglo-Celtic Isles were about to be radically changed. In Alba, King Mac Bethad, laid claim to the Earldom of Orkney, in violation of Thorfinn the Mighty's reign. Althoiugh war seemed imminent, an Irish priest present with the troops that worked in the service the Earl of Orkney. The priest is reported to have requested on the behalf on Christendom to cease and desist. Mac Bethad took offense that a foreign land would dare meddle in his affairs. Regardless of the legends, what is known is that Mac Bethad beheaded the priest and sent the head to Thorfinn with a declaration of war.
As construction began in Alba on Mac Bethads fleet, word reached Atha Cliath via Orcanian messengers of Thorfinn, of the act of war perpetrated by the Alban monarch. Niall, eager to win a victory of his own dispatched several of the An Baid to deal with the Alban fleet. According to popular legend of the time, they met with an Orcanian fleet, the Irish and Orcanian fleet arrived at the mouth of the Uisge For and made battle with the fleet of Alban ships. Although outnumbered the Orcanians and the Irish managed to defeat the Alban force. The resulting loss forced Mac Bethad to declare suicide.
In reality, the "Battle of Uisge For" was a lopsided raid. Due to construction difficulties and a bad storm a month before, the Alban fleet was largely unbuilt and the ships that were in the water had taken on some water damage. Meanwhile the Orcanian-Irish fleet was well manned and prepared. When they found the Albans unprepared they attacked and destroyed the fleet and launched a raid all along the coast of eastern Alba. The resulting chaos allowed Mael Coluim mac Donnchada to seize the throne from Mac Bethad in 1057. Mael Coluim was eager to respect the old alliance with the Irish and the Orcanians.
With this small victory, Niall gained respect from his countrymen and his contemporaries in the Anglo-Celtic Isles. As trade continued to grow so did Irish ports and Atha Cliath became home to the completed stone Castle O'Brien and the first hospital in Ireland. Niall also donated land to the Catholic Church in Ireland building new churches throughout the kingdom. The first rudimentary roads were built between Corcaigh, Luimneach, Port Laigre and Atha Cliath. Niall also began to extend Imperial power in Ulster with the development of of a base for the An Baid in Carraig Fhearghais. Niall would be remembered as a great leader when he died at age 66 in his sleep in 1081.