Sir John de Burdon, acted as the Constable of Berwick Castle, the Sheriff of Berwick during 1298-1303.Watson, p.xviii.
Biography John was a knight from Nottinghamshire & Derbyshire. He was appointed keeper of Berwick Castle in 1298 in Scotland, which was the administrative centre as Sheriff of Berwick during the English administration of Scotland.Watson, p.115.
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References
People of Medieval Scotland - John Burdon, constable of Berwick