919 Constantine marries Romanus’ daughter Helena. Romanus (I) Lecapenus crowned emperor as colleague to Constantine.
920 Christopher, son of Romanus, is raised to the imperial dignity.
921 The war with the Bulgarians assumes serious proportions; further increased
923 by an alliance between King Simeon of Bulgaria and the Mohammedans.
926 A temporary end is put to the troubles with the Bulgarians and Arabs by an interview between Romanus and Simeon.
927 Peter, Simeon’s successor, enters Byzantine territory, demanding war or the hand of the emperor’s granddaughter. Romanus agrees to the latter alternative.
928 Romanus makes his sons, Stephanus and Constantine VIII, associate emperors. There are now five emperors.
931 Death of Christopher.
934-940 Period of complete peace in the empire, except for petty warfare with Lombard princes. Constantine VII plans to regain the sole power.
941 A Russian fleet of ten thousand galleys appears before Constantinople. Romans drive them off with small force.