Calendar of Papal Registers Relating To Great Britain and Ireland: Volume 12, 1458-1471. Originally published by His Majesty's Stationery Office, London, 1933.
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'Lateran Regesta 540: 1458', in Calendar of Papal Registers Relating To Great Britain and Ireland: Volume 12, 1458-1471, (London, 1933) pp. 20. British History Online https://www.british-history.ac.uk/cal-papal-registers/brit-ie/vol12/p20 [accessed 26 April 2024]