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Brockhaus-1809: Marcus Tullius Cicero
Brockhaus-1837: Cicero
Brockhaus-1911: Johann Cicero · Cicero [2] · Cicero
DamenConvLex-1834: Cicero
Eisler-1912: Cicero, M. Tullius
Herder-1854: Cicero [2] · Cicero [1]
Meyers-1905: Cicĕro [1]
Pierer-1857: Cicĕro [2] · Cicĕro [1]