The Sarum rite of Mass was one of the rites of celebrating Mass in use in England before the reformation. It is more properly called the Rite of Salisbury and originated as the Rite used in the Cathedral of that place. One Mass in particular was extremely popular with the English people: the Mass of the Five Wounds. In the Sarum missal, just before the text of this Mass is related the story of how it came to be:
"S Boniface the pope was sick, even unto death; and he urgently besought God to prolong his life in this world. God sent to him S Raphael the Archangel with the Office [the word Officium can also mean the Introit] of the Mass of the Five Wounds of Christ, saying to the Pope “Get up and write this Office, and you shall say it five times; and straightway you will receive health. And what priest soever shall devoutly celebrate this Office for himself or for another sick person five times, he shall receive health and grace, and in the future shall possess life eternal, provided he perseveres in good. And in whatsoever tribulation a man shall be set in this world, if he procures from a priest that this Office be said for him five times, without doubt he shall be set free. And if it shall be said for the soul of one departed, immediately after it shall have been completely said, that is, five times, his soul shall be loosed from pains”.
Pope S Boniface therefore, hearing these things, immediately got up in the place where he lay sick, and conjured him [the angel] by Almighty God that he should depart from him without any danger to himself, and should straightway give a sign who he was, and for what purpose he had come to him. He [the Angel] at once said that he was the archangel Raphael sent to him from God, and promised that the things listed above would without doubt be ratified. Pope s Boniface then confirmed the Office by his apostolic authority, granting to all, truly confessed and penitent, who should say it for the fifth time, a seventh part of the remission of all their sins. And likewise, he loosed in the Lord forty days of mortal sins and one year of venial sins to all who should procure the aforesaid office to be said."