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1. Erasmus, Apophthegmata, VI, Vespasianus Pater, XVII.
2. Doubtless Henry IV.
3. Details from the anonymous Tesoro politico per li disegni de Principe and from Froissart.
4. Johannes Zonaras; Xenophon, Cyropaedia, I, ii; Seneca, Epist. moral., LXXXVIII, 19.
5. Livy, II, xlv; Simon Goulart, Histoire du Portugal, V, vii.
6. Diodorus Siculus, Philistus; the historian–admiral killed himself after being defeated by Dion (356 BC).
7. Jeronimo Conestaggio, Dell’unione del regno di Portogallo alla… Castiglia (Genoa, 1585); interpolated quotation from Livy, II, iv.
8. Cf. I, 37, ‘On Cato the Younger’ (of Utica). Plutarch’s Life is the main source.