His support for Alice Kyteler, his sister-in-law, gained him the enmity of Richard de Ledrede, Bishop of Ossory, and in 1328 Arnold was arrested on charges of heresy and died in Dublin Castle while awaiting trial.
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Alice Kyteler fled to England and remained there, Alice Smith also fled, but her mother Petronilla de Meath became Ireland's first heretic to be burned at the stake.