The Roman Empire was the all conquering force in the 1st Century AD with territories throughout Europe, North Africa, and the Middle East. Roman infrastructure - roads, water supplies, legal system - spread throughout the Empire.
Paul says that Jesus followers are "more than conquerors" - that they were more than the might of Rome. He reassured the Christians in Rome that despite the problems they were experiencing, nothing earthly or spiritual could separate them from the love that God has for them in Jesus. We are more than conquerors. We are not victims. Our place in the kingdom of God is not measured by our power or wealth but how we respond to whatever life throws at us.