Anecdote on page 670 of "The Pictorial History of Scotland" by James Taylor DD of Elgin first published in 1858. Dr Taylor was quoting from the Coltness Collections published by Maitland Club:

"On his return from Edinburgh, Cromwell passed along the uplands near the Kirk of Shotts, and called at Allertoun, a mansion-house belonging to Sir Walter Stewart ... (it is quite lengthy) .. he drank his good wishes for the family, and asked for Sir Walter; (who was absent with the Scottish Army) and was pleased to say his mother was a Stewart's daughter, and he had a relation to the name ... The lady (of the house) had been a strenuous royalist, and her son a captain in command at Dunbar; yet upon this interview with the general (Cromwell) she abated much of her zeal. She said she was sure Cromwell was one who feared God, and had that fear in him, and the true interest of religion at heart."