[1] In 1411, a sentence of excommunication was issued by the Archbishop of Canterbury, Thomas Arundel, against Castell, Fellows at the College — Robert Burton (later Master of the College), John Hamerton, and Adam Redyford — and the College as a whole, due to Lollardy leanings.
[2] An appeal to the Pope against the excommunication was made by the bursar of the College, John Ryvell.
Castell survived the controversy and continued as Master until 1420.
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