“Omnia mutantur, nos et mutamur in illis, ” is by
Nicholas Borbonius, a Latin poet of the sixteenth century. Dr. Sandys
says that the Emperor Lothair, of the Holy Roman Empire, had already
said, “Tempora mutantur, nos et mutamur in illis. ”
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894