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It received its name during the episcopate of Alexander de Bicknor (1317–1349), when the parish of St. Nicholas was extended outside the city so as to include the Manor of St. Sepulchre and the Deanery of St Patrick.
It appears that the Castle was occupied for the next hundred years by successive Archbishops of Dublin until Archbishop Alexander de Bicknor, who built a new Archiepiscopal palace at Tallaght in 1324.