Calendar of Papal Registers Relating To Great Britain and Ireland: Volume 11, 1455-1464. Originally published by His Majesty's Stationery Office, London, 1921.
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'Vatican Regesta 523: 1463', in Calendar of Papal Registers Relating To Great Britain and Ireland: Volume 11, 1455-1464, (London, 1921) pp. 697-698. British History Online https://www.british-history.ac.uk/cal-papal-registers/brit-ie/vol11/pp697-698 [accessed 24 March 2024]