Calendar of Papal Registers Relating To Great Britain and Ireland: Volume 6, 1404-1415. Originally published by His Majesty's Stationery Office, London, 1904.
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'Regesta 337: 1409', in Calendar of Papal Registers Relating To Great Britain and Ireland: Volume 6, 1404-1415, (London, 1904) pp. 99-100. British History Online https://www.british-history.ac.uk/cal-papal-registers/brit-ie/vol6/pp99-100 [accessed 23 April 2024]