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Among the relatives of senators included in this category are: grandparents, parents, uncles and aunts, cousins, fathers/mothers-in-law and probable relatives. The same relatives of known equestrians are also included except for grandparents; but in addition I have included wives, siblings, children, grandchildren, nephews, nieces and brothers/sisters-in-law. Individuals from the following groups are also included: (i) magistrates of uncertain office (owing to textual lacuna or an imprecision in a literary source); (ii) auctores iuris; (iii) recipients of imperial rescripts; (iv) correspondents and amici of authors such as Pliny, Plutarch and Fronto; (v) names on building materials from Rome (viz. fistulae plumbeae, tegulae); (vi) viri honesti and feminae honestae; (vii) mobiles vel certe divites. This phrase is frequently applied by the editors of PIR to include individuals of the upper strata of Roman society for whom further precision is not possible. They tend to fall chiefly into the following categories: (a) persons mentioned in literary sources in a context suggesting wealth and influence, e.g. persons within the social circles of the senatorial elite such as amici of senators, victims of imperial purges or members of conspiracies; (b) persons whose nomenclature suggests membership of the upper orders e.g. homonyms of known senators or equestrians or those possessing extended polyonymous names; (c) persons mentioned in inscriptions who were of obvious wealth but indeterminate status such as large landholders, owners of villas, masters of numerous slaves, recipients of honours or laudations from councils or corporations that suggest exalted rank. The subjectivity with which individuals from this last category have been included is freely admitted.