Sosibios – a literary term where two or more historical figures of differing time periods converse in prose or poetry. This term is named after Sosibios, the neo-Attic Athenian sculptor who crafted the Pentelic marble vase in Keats’ poem “Ode on the Grecian Urn,” where Keats asks questions of the time-frozen figures found thereon.
Reference to this literary term is linked here:
http://www.griffinpoetryprize.com/hillary-and-eleanor-9-the-pearl-roundabout/