The Nuttall Encyclopedia
The name given to a pilgrim to the Holy Land who had performed his vow, in sign of which he usually bore a palm branch in his hand, which he offered on the altar on his return home.
Wood, James, ed. Entry for 'Palmer'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/p/palmer.html. Frederick Warne & Co Ltd. London. 1900.