R.A. Hendley wrote:
I can't help but ponder the two end carvings with the monks. The one to the far left reminds me of the 'Harrowing of Hell' or 'Christ in Limbo' motif.
Yes, I thought the same thing too, it very much reminds me of the harrowing. Of course, it isn't Christ rescuing the souls, so almost certainly not the harrowing after all. Maybe it means that the monks are rescuing those in purgatory by their chants or something?
I found this image which shows the extremely prominent place that the retable sits in the church:
Indeed, surrounded by the four evangelists, in the centre, behind the altar, I think it is very likely that we see an image of Christ here, a very unusual one, one that matches very well to the Tarot de Marseille I. Another option that makes sense to me, considering the name of the church, might be St. James; but I think Christ is more compelling.
We really need to learn more about this retable, the story being told on the panels would be very interesting to know.