This was originally Plate III of Marietta’s monumental 1953 book production,
Tableaux in Greek History.
(See ‘Illustrations’ for the other 8 illustrations used in Tableaux, all of which – including ‘Holy Trinity’ – are available as unmounted ‘Artist’s Proofs’.)
The newly-framed (2025) and mounted example of this illustration, featuring Marietta Pallis’s handwritten notes on the back of the mounting board, is now in a private collection in London.