Rest in peace (acronym R.I.P.) in the second person singular, or “Requiescite in pace” in the second person plural. In the common phrase "Requiescat in pace" the "-at" ending is appropriate because the verb is a third-person singular present active subjunctive used in a hortative sense: "May he/she rest in peace." The phrase was first found on tombstones some time before the fifth century. It became ubiquitous on the tombs of Christians in the 18th century, and for High Church Anglicans, Methodists, as well as Roman Catholics in particular, it was a prayerful request that their soul should find peace in the afterlife.
Latin influence in English languages. Christian missionaries coming to Britain in the 6th century and 7th century brought with them Latin religious terms which entered the English language: "abbot", "altar", "apostle", "candle", "clerk", "mass", "minister", "monk", "nun", "pope", "priest", "school", "shrive". Some of these words are ultimately of Greek origin, as much of the technical language of Christianity developed from the Greek of the New Testament and the works of those Fathers of the Church who wrote in Greek. During this time, the Catholic Church had great influence on the development and expansion of the Old English language. Catholic monks mainly wrote or copied