In Loving Memory of with comma or no comma? [closed]
No, such an inscription should not have a comma, either in its one-line form or two-line form. None of the functions of a comma, such as dividing a sentence or setting off parenthetical material, or indicating a short pause in recitation, is appropriate at that place in that inscription.
I cite as supporting evidence an exhaustive (OK, it took me 5 minutes) examination of images of headstones in English churchyards, courtesy of Google Images.