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The Synod of Whitby of 664 forms a significant watershed in that King Oswiu of Northumbria decided to follow Roman rather than Celtic practices, but the two rites co-existed for another century, Wales observing the Celtic Easter date until 768.
British Naval Intelligence had been aware of the arms shipment, Casement's return, and the Easter date for the rising through radio messages between Germany and its embassy in the United States that were intercepted by the Navy and deciphered in Room 40 of the Admiralty.