This head represents the Roman emperor Nerva (reigned A.D. 96-98). Most of his portraits are recarved from portraits of Domitian (see, for example, a head in Rome: K. Fittschen and P. Zanker, Katalog der römischen Porträts in den Capitolinischen Museen, vol. 1, 1985, p. 37, no. 34, pl. 38). The present head appears also to be recarved, based on the cursory workmanship of the back. An "original" portrait of Nerva is in Copenhagen: F. Johansen, Catalogue Ny Carlsberg Glyptotek. Roman Portraits, vol. 2, 1995, p. 88f., no. 31.