What are the reasons for the weakening and death of the Bosporus kingdom?

1. The invasion of the barbarians, who devastated most of the cities and ports of the Bosporan state.
2. Refusal of Rome from the protection for which the inhabitants of the Bosporus offered an annual tribute.
3. Internecine wars between those who wanted to seize the Bosporus throne.
4. The final fall happened under the onslaught of Byzantium.



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