 On 20 February 1421 Pope Martin V granted a relaxation of penance to penitents who on the feast of St Denis should visit and give alms for the conservation and repair of the priory, which was founded and sufficiently endowed for a prior and twelve canons, but had become impoverished.Prior John Depyng was made abbot of St Osyth's Priory in 1434, and took with him goods of considerable value belonging to the priory.He never returned these, and after his death St Botolph's brought an apparently unsuccessful lawsuit in Chancery against St Osyth's for their recovery.