There are a number of references in the Annals to Viking bases been set up on the Shannon, particularly in the larger lakes of Lough Derg and Lough Ree. There were two distinct periods of Viking activity on Lough Ree starting In the ninth century when the Vikings had a fleet on the lough. The Annals of Ulster for 845AD say ‘There was an encampment of the foreigners i.e. under Tuirgéis on Loch Rí, and they plundered Connacht and Mide, and burned Cluain Moccu Nóis (Clonmacnoise) with its oratories, and Cluain Ferta Brénainn (Clonfert), and Tír dá Glas (Terryglass) and Lothra (Lorrha) and other monasteries’. Later another base was built between Dromineer and Castlelough in the lands of the O’Sextons. It was from the Shannon that the majority of raids into County Offaly were carried out. A very early and unusual entry in the Annals of Ulster for 749 says ‘ships with their crews were seen in the air above Cluain Moccu Nóis’.
The following year Tuirgéis was captured by Maelsechlainn and drowned by him in Lough Owel outside Mullingar. The Annals of Ulster for 922AD say ‘The fleet of Limerick, that is of Ailche’s son went on Loch Rí, plundered Clonmacnoise and all the islands on Loch Rí and took great booty in gold, silver and much treasure’. In 924AD the entry reads ‘Kolli son of Bárðr ‘Lord of Luimnech’ raids Lough Ree’.
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