Year 564 (DLXIV) was a leap year starting on Tuesday (link will display the full calendar) of the Julian calendar. The denomination 564 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Britain Cadoc, abbot of Llancarfan (Wales), settles in Weedon and is made bishop (approximate date). August 22 – Columba reports seeing the Loch Ness Monster at the River Ness (according to the "Life of St. Columba"). Mesoamerica Tulum, Maya walled city, on the Yucatán Peninsula (modern Mexico) is first mentioned on a stele inscription. By topic Religion Samson of Dol, one of seven founder saints of Brittany, attends a council in Paris and witnesses several royal decrees (approximate date). Births Hermenegild, Visigoth prince (approximate date) Li Baiyao, Chinese official and historian (d. 647) Deaths Gao Bainian, crown prince of Northern Qi (b. 556) Laisrén mac Nad Froích, Irish monk and saint Petroc, Celtic prince and saint (approximate date) Tudwal, Breton monk and saint (approximate date) References