The TWO ways Justinian united the Byzantine Empire are:
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Adoption of a uniform legal code for the Empire - This is known as the Corpus Juris Civilis, or the "Body of Civil Law," which helped to standardize legal practices across the empire.
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Instituting a large bureaucracy to administer commands and regulations - Justinian created a centralized administration that helped enforce his laws and policies, contributing to unity within the Empire.
The other options related to reducing taxes or sharing power do not directly correlate with the unification efforts that were characteristic of Justinian's reign.