Calendar of Papal Registers Relating To Great Britain and Ireland: Volume 5, 1398-1404. Originally published by His Majesty's Stationery Office, London, 1904.
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'Lateran Regesta 63: 1399', in Calendar of Papal Registers Relating To Great Britain and Ireland: Volume 5, 1398-1404, (London, 1904) pp. 181-182. British History Online https://www.british-history.ac.uk/cal-papal-registers/brit-ie/vol5/pp181-182 [accessed 25 April 2024]