Final answer:
Multiple factors led to the weakening of the Byzantine Empire under Emperor Justinian I.
Explanation:
The main reasons for the weakening of the Byzantine Empire during the reign of Emperor Justinian I were multi-faceted:
- Financial Strain: Justinian's reckless financial policies led to heavy taxation on provinces to fund multiple wars.
- Military Expenses: Costly and ongoing wars with Persia and Italian campaigns drained the empire's resources.
- Plague and Invasions: The empire faced internal challenges like the great plague of 544 and external threats from invasions by new hordes from the north.
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