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... Paetus Lucullos, Pompeios et si qua C[a]esa[res] obtinendae donandaeve...

si qua: "qua" equivalent to "quae," n. pl. pronoun; "si qua" equivalent to "quaecumque," "whatever the Caesars (that is, the emperors) had done to acquire and bestow Armenia"; "obtinendae" is a dat. gerundive expressing purpose.