Interesting detective work. Two Hyperides speeches have been discovered in a palimpsest believed to have been created by Byzantine monks in the 13th century. Hyperides lived from 390 or 389 B.C. until 322 B.C. and was an orator who made speeches at public meetings of the citizen assembly. A contemporary of Aristotle and Demosthenes, he wrote speeches for himself and for others and spoke at important political trials. In 322 B.C. Hyperides was executed by the Macedonians for participating in a failed rebellion.