What subject was the basis for early oratorio texts?

Marcus Aurelius was

a. an emperor and poet. b. an emperor and Stoic philosopher. c. a poet and Platonic philosopher. d. Hadrian's lover. e. an equestrian monument.

Before the lights dim on the audience for the opening of Eurydice, what image appears on the stage right projection screen?

A. An alter B. A throne C. A pair of eyes D. A human face