Only one source explicitly states that ‘Passienus was slain by the treachery of Agrippina’ and that is a confused marginal note on a much later manuscript of Juvenal’s fourth satire. This satire mentions a Quintus Crispus, and, at some point in the fourth or fifth century, a scholar attempted to add a helpful note to the margin of his manuscript explaining who Quintus Crispus was. Unfortunately, the scholar got a little muddled with his Crispuses and accidentally wrote a 115-word mini-biography of Passienus Crispus instead.