Constantine tracing the Boundaries of the New Capital. The transference of the capital of the Roman Empire was mainly due to the unfitness of the ancient capital as headquarters from which to direct the defence of the line of the Danube. When attendants spoke of the extensive boundary which he was tracing the Emperor replied that a heavenly guide marched before him. Illustration for Hutchinson's History of the Nations (Hutchinson; c.1920). Note: Image has been digitally enhanced to facilitate repro.