The chief feature indeed of this age is its literary interest. Two Emperors ruled whose pride it was to be men of letters. Leo the wise, and Constantine born in the purple, were both men who wrote of war and government as they knew them, and left to their successors remarkable pictures of their times. Leo describes the military forces which had still a magnificent organisation and a record of victory and valour but little tarnished. The nobles of Constantinople could fight as well as intrigue. Rich, brave and popular, the ancient families which lingered so long after the Mohammedan conquest in the ancient houses of the Phanar could always be relied upon to furnish gallant officers for the troops. Constantine wrote of the Themes, of the Imperial administration, and of the court ceremonial--the last an extraordinary work describing the dignity and state of the emperors, and regulating the minutest detail of the pomp with which their daily life was surrounded. The Court of the Eastern Empire indeed was by far the most brilliant of the Middle Ages, and the Empire itself, weak and corrupt though it may seem, was much the strongest government of the time, and the one under which life and property were most secure. The commerce of Constantinople was still greater probably than that of any other city of the world. East and West poured their treasures into the city. The reign of Constantine Porphyrogenitus was diversified, like those of so many of his predecessors, as has already been said, by revolutions, which placed many Cæsars on at least the steps of the throne. Romanus and his sons Constantine (called the Eighth) and Stephen, came to an end in 945, and from that time till his death in 958 Constantine VII. reigned alone. His son, Romanus II., succeeded him, and to him came a time of war, in which his arms were victorious over the Mohammedans through the genius of his general, Nicephorus Phocas. In 963 Romanus died, and Nicephorus, marrying his widow Theophano, became joint Emperor with the young Basil.