Account rolls often throw a flood of light upon the income derived from appropriated churches. To the nuns of St Michael's Stamford had been assigned by various abbots of Peterborough the churches of St Martin, St Clement, All Souls, St Andrew and Thurlby, and in the reign of Henry II two pious ladies gave them the moieties of the church of Corby and chapel of Upton[316]. Moreover in 1354, after the little nunnery of Wothorpe had been ruined by the Black Death, all its possessions were handed over to St Michael's and included the appropriation of the church of Wothorpe; the bishop stipulated that the proceeds of the priory with the rectory should be applied to the support of the infirmary and kitchen of St Michael's and that the nuns should keep a chaplain to serve the parish church of Wothorpe[317]. Corby and Thurlby were afterwards farmed out by the nuns[318] and in 1377-8 they brought in L19 and L20 respectively, while the nuns got L26. 0_s._ 8_d._ from "the church of All Saints beyond the water," L1. 13_s._ 4_d._ from the parson of Cottesmore and a pension of 6_s._ 8_d._ from the church of St Martin. They paid the vicar of Wothorpe a stipend of L2 a year[319]. Over half their income was usually derived from "farms, tithes and pensions," i.e. from ecclesiastical sources of revenue. It was also very common to make grants of tithes out of piety to a monastery, even when a grant of the advowson of the church was not made. A lord would make over to it the tithes of wheat, or a portion of the tithes, in certain parishes, or perhaps the tithes of his own demesne land. Sometimes the rector of a parish would pay the monks or nuns an annual rent in commutation of their tithes; sometimes he would dispute their claim and the tedious altercation would drag on for years, ending perhaps in the expense of a law-suit[320]. Besides advowsons and tithes various other pensions and payments were bestowed upon religious houses by benefactors, who would leave an annual pension to a monastery as a charge upon a particular piece of land, or church, or upon another monastery[321].