Shepherds as Dioscuri?

Still reading 18th century books from Matthew Boulton’s library (or rather copies of books he owned, not the very books themselves…)

This image got me thinking.

Un-illustrated entries in OCRE.

Which led me to this:

And also these rather interesting types with variations on the wolf and twins imagery from late antiquity:

http://numismatics.org/ocre/id/ric.6.rom.189

(The female figure grasping Mars’ hand is clearly Venus)

all related types in OCRE.