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Constantinian

Constantinian, a.
  (kɒnstənˈtɪnɪən)
  Of or belonging to the Roman Emperor Constantine the Great, or his period (a.d. 306–337).

1641 Milton Animadv. (1851) 215 As well the gold of those Apostolick Successors that you boast of, as your Constantinian Silver. 1861 A. Beresford-Hope Eng. Cathedr. 19th C. 152 The state of society existing in Constantinian, but not in Carlovingian Rome. 1865 Ecclesiologist Feb. 2 The columns of the interior octagon are of Constantinian date.

Oxford English Dictionary

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