Calendar of Papal Registers Relating To Great Britain and Ireland: Volume 1, 1198-1304. Originally published by Her Majesty's Stationery Office, London, 1893.
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'Regesta 36: 1268 and undated', in Calendar of Papal Registers Relating To Great Britain and Ireland: Volume 1, 1198-1304, (London, 1893) pp. 441. British History Online https://www.british-history.ac.uk/cal-papal-registers/brit-ie/vol1/p441 [accessed 26 April 2024]