Why was emperor constantine historically significant to the roman empire?

Correct 1. first Roman emperor to convert to Christianity and 2. moved the capital to present day Istanbul

Explanation: Constantine was a lauded Emperor and general who converted to Christianity on his deathbed and who moved the imperial palace to present day Istanbul (named Constantinople for years)

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i'm not so sure but i hope this in anyway.

the president of russia is head of state, and of a multi-party system with executive power exercised by the government, headed by the prime minister, who is appointed by the president with the parliament's approval.

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the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).