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| 904 |
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| The Saracen corsair Leo of Tripoli stormed Thessalonica, plundered it, and carried off some 20,000 of the inhabitants. | 1 |
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| 907 |
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| The Russians, under their prince, Oleg, appeared again at Constantinople and secured rights of trade. | 2 |
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| 912–13 |
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| Alexander II, the brother of Leo, emperor for less than a year. | 3 |
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| 912–59 |
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| Constantine VII (Porphyrogenetos) ascended the throne as a child, with a regency composed of his mother, Zoë, the patriarch Nikolas, and John Eladas. Constantine was a learned man of artistic tastes. He never really governed, leaving the actual conduct of affairs to strong men who were associated with him. | 4 |
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| 913–27 |
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| The Bulgarian threat. Symeon styled himself emperor (tsar) of the Romans and undoubtedly hoped to possess himself of the imperial crown. In 913 he appeared at Constantinople; in 914 he took Adrianople, only to lose it again. But in 917 he defeated a Byzantine army at Anchialus. The war ended only after Symeon's death in 927. | 5 |
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| 915 |
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| A Byzantine victory over the Arabs at Garigliano assured the empire of its possessions in south Italy. | 6 |
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| 920–44 |
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| Romanus Lecapenus, coemperor with Constantine. He was the emperor's father-in-law, an able but ruthless Armenian whose whole policy was designed to strengthen his own control and establish that of his family. | 7 |
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| 920–42 |
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| Brilliant campaigns of the Byzantine general John Kurkuas in the east. He took the modern Erzerum (928) and Melitene (934) and extended the imperial power to the Euphrates and Tigris. | 8 |
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| 920 |
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| Official reunion with Rome. | 9 |
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| 924 |
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| The piratical fleets of Leo of Tripoli were completely defeated off Lemnos. Nevertheless, the Muslims continued activity in the Mediterranean. | 10 |
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| 927 |
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| The empire suffered from a great famine, which probably explains the stringent legislation of the government to prevent the purchase of small holdings by the great landed magnates. | 11 |
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| 941 |
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| A great armada of Russians, under Prince Igor, was signally defeated by the Greeks. | 12 |
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