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Dean Cogan was a nineteenth century Roman Catholic Irish priest (awarded the religious title of dean) who wrote a famous history of the Diocese of Meath in Ireland. Published in two volumes in 1862 and 1867, Cogan's The Diocese of Meath was an important history on Christianity in Ireland.
Cogan's work led to the naming of a street, Dean Cogan Terrace in his memory in Navan, where he had served as a curate.