St. Thomas of Lancaster's Accomplices

In No. 15. I find an extract from Rymer, by MR. MONCKTON MILNES, relative to some accomplices of St. Thomas of Lancaster, supposed to have worked miracles. —Query, Was "The Parson of Wigan" one of these accomplices, and what was his name? Was he ever brought to trial for aiding the Earl, preaching sedition in the parish church of Wigan, and offering absolution to all who would join the standard of the barons? and what was the result of that trial—death or pardon?