Alice, Lady Lovat wrote a biography of Bishop Aeneas Chisholm in 1927, and she relates that: 'Bishop Grant, when parish priest at Eskadale, took the following prayer, which he translated from Gaelic, from the mouth of John MacDonald, of Eskadale, who was then ninety-nine years of age, and who had learnt it eighty years before from Donald MacGruar, of Strathglass, who was then seventy years old.' Bishop Grant, at the age of 26, was ordained in 1733 and died in Aberdeen in the year 1778. So presumably this prayer is from the 17th century or before.