There is a  permission  for priests to pray three Masses in one day on All Souls’ Day, although not many know the origin of this custom.   On August 10, 1915, Pope Benedict XV issued this authorization.  Part of the reason he did this was that he was a great student of history, and realized that in England and many Protestant countries where church buildings and chapels had been desecrated and put to profane (non-liturgical) use, they had been built with funds and endowments where the donors had requested Masses to be said for the repose of their souls.  Those funds had been stolen, and the Masses never said. Benedict wrote: “We are strongly impelled, to supply in some wise, as far as in us lies, the suffrages omitted.”