#OTD in 1170 – Diarmait Mac Murchada and the Normans march on the Norse kingdom of Dublin, avoiding an Irish force that awaits them to the south of it.

Dublin falls to them on this date. Some Norsemen, including the king of Dublin, Ascall mac Ragnaill, flee to the Hebrides or the Isle of Man.

The Normans and Diarmait held a council of war at Waterford and agreed to take Dublin. High King Ruaidrí deployed a large army near Dublin to intercept them. As well as soldiers from Connacht, it included troops from Breffny (led by King Tigernán), Meath (led by King Máel Sechlainn), and Oriel (led by King Murchad Ua Cerbaill). The Normans and Diarmait bypassed them by travelling over the Wicklow Mountains, forcing Ruaidrí’s army to abandon their plans.

When they reached Dublin, Diarmait began negotiations with its king, Ascall mac Ragnaill (Ascall MacRannall). While talks were ongoing, a force of Normans—led by Miles de Cogan and Raymond FitzGerald—stormed the town and took it. Ascall and his followers fled in their ships but vowed to re-take the town. Strongbow and Diarmait then launched “a devastating campaign” through Meath and into Breffny, burning Clonard, Kells, and several other monastic towns. In response to these violations of the Ferns agreement, Ruaidrí executed three hostages, including Diarmait’s son.

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