[Footnote 42: I have traced the Roman duchy according to the
maps, and the maps according to the excellent dissertation
of father Beretti, (de Chorographia Italiae Medii Aevi,
sect. xx. p. 216-232.) Yet I must nicely observe, that
Viterbo is of Lombard foundation, (p. 211,) and that
Terracina was usurped by the Greeks.]