The man who saved Jamestown from failure in its early days was.

John Rolfe

John Smith

Humphrey Gilbert

John Smith

Explanation:

John Smith may have saved the settlers of Jamestown from starving to death.

The colony may well have perished had it not been for the leadership of JOHN SMITH. He imposed strict discipline on the colonists. "Work or starve" was his motto, and each colonist was required to spend four hours per day farming.