Papyrus Oxyrhynchus 658 (P. Oxy. 658 or P. Oxy. IV 658) is one of four examples of libelli found at Oxyrhynchus in Egypt. The last lines of the manuscript declare the date — the first year of the emperor Decius, whose full name was Gaius Messius Quintus Traianus Decius. We know the first year of his reign was 250 AD.