Reading Prudentius, especially his poems Psychomachia and Peristephanon, I think her "footsteps" (whoever she was, whenever she was his life) are there for the reader who searches for them; as Lady Certainly, depicted herein, has.
This is an original conjecture on the famously absent document, itself a conjecture, called, among scholars, "Q."
What drives us? What gives us our inspiration? What do they all have in common?
