Dublin (A´th Cliath), archiepiscopal diocese of. Originally a Norse city-state, Dublin was one of the first regular episcopal sees in Ireland subject to Canterbury. There developed a strong link between Dublin and Canterbury, and 12th-cent. bishops were usually monks from the Canterbury province. Soon to be the centre of Henry II's colonial administration, Dublin became an archbishopric at the Council of Kells-Mellifont (1152). In 1238 Dublin unsuccessfully challenged the primatial claims of Armagh. It is still the see of both catholic and Anglican archbishops.