Which emperor was known for moving the roman capital to a safer place?

The founder of the Byzantine Empire and its first emperor, Constantine the Great, moved the capital of the Roman Empire to the city of Byzantium in 330 CE, and renamed it Constantinople.

Constantine.

He moved the capital from Rome to Byzantium, which he re-named Nova Roma ("New Rome"). After his death, the city was renamed Constantinople in his honor…. Today it is known as Istanbul.

i thinl it is the 1st answer

disease was the number one killer of native peoples. they had had little exposure to the diseases of europe. this led to some villages being almost completely wiped out and some tribes destroyed.