Justinianian

adjective Jus·tin·i·a·ni·an

variants: or Justinianean \ˌjə¦stinē¦ānēən\

Definition of Justinianian

: of or relating to the Byzantine emperor Justinian under whom much of the Western Empire was reconquered and the laws codified in the Justinian Code

the Justinianean ordinances on the subject of divorce were revived
—B. J. Kidd

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Origin and Etymology of justinianian

Justinianian from Justinian I †565 Byzantine emperor (from Late Latin Justinianus) + English -ian; Justinianean from Late Latin Justinianeus of Justinian (from Justinianus Justinian) + English -an