Walkers pass near the ruins of Milecastle 39 on Hadrian's Wall, once the northern frontier of Rome's empire from Barbarian tribes. In Pictures Ltd./Corbis via Getty Images
Walkers pass near the ruins of Milecastle 39 on Hadrian's Wall, once the northern frontier of Rome's empire from Barbarian tribes. In Pictures Ltd./Corbis via Getty Images

Why Iran renamed the supertanker 'Grace 1' the 'Adrian Darya-1'