Calendar of Papal Registers Relating To Great Britain and Ireland: Volume 3, 1342-1362. Originally published by Her Majesty's Stationery Office, London, 1897.
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'Papal Chronology', in Calendar of Papal Registers Relating To Great Britain and Ireland: Volume 3, 1342-1362, (London, 1897) pp. xiv. British History Online https://www.british-history.ac.uk/cal-papal-registers/brit-ie/vol3/xiv [accessed 24 April 2024]