Emperor Hadrian was a Roman ruler who reigned from 117 to 138 AD. He is best known for consolidating and fortifying the Roman Empire's borders, particularly through the construction of Hadrian's Wall in Britain, which marked the northern limit of Roman territory. Hadrian was also a patron of the arts and architecture, commissioning many buildings, including the famous Pantheon in Rome. Hadrian was born in Spain and became known for his travels throughout the empire, promoting unity and cultural exchange. He was a proponent of Hellenism, embracing Greek culture and philosophy, which influenced his policies and personal interests. His reign is often considered a period of relative peace and stability in Roman history.