Lanfranc, basing himself, he said, on Bede's writings, had already assured Pope Alexander II that Dublin formed part of the province of Canterbury and that it was for him to consecrate the new bishop.
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By 1058 Toirdelbach had gained Diarmait's support, for he was present when Diarmait, the Leinstermen and the Osraige drove Donnchad from Limerick, which he burned so that it would not fall into the hands of his enemies, and defeated him at Sliabh gCrot in the Galtee Mountains.