Only seven of his estimated seventy to ninety plays have survived. There is a long-standing debate regarding the authorship of one of them, Prometheus Bound, with some scholars arguing that it may be the work of his son Euphorion. Fragments from other plays have survived in quotations, and more continue to be discovered on Egyptian papyri. These fragments often give further insights into Aeschylus' work. He was probably the first dramatist to present plays as a trilogy. His Oresteia is the only extant ancient example. At least one of his plays was influenced by the Persians' second invasion of Greece (480–479 BCE). This work, The Persians, is one of very few classical Greek tragedies concerned with contemporary events, and the only one extant. The significance of the war with Persia was so great to Aeschylus and the Greeks that his epitaph commemorates his participation in the Greek victory at Marathon while making no mention of his success as a playwright.