Leo VI (Leo the Wise or Leo the Philosopher), 862?–912, Byzantine emperor (886–912), son and successor of Basil I. He added to the work of his father by the publication (887–93) of the Basilica, a modernization of the law of Justinian I and of canon law. Leo attempted to end the schism which had been provoked by the patriarch Photius, but the quarrel was renewed (906), partly over the issue of Leo's fourth marriage. During his reign, Leo was forced to pay tribute to the Bulgars after his defeat in 896. The Arabs completed the conquest of Sicily by taking Taormina in 902. They then sacked Salonica (906), and advanced in Asia Minor. Among Leo's edicts are the Tactics, for the army and navy, and the Book of the Prefect, on the duties of that officer, including his jurisdiction over the guilds of Constantinople. Leo was succeeded by his brother Alexander (reigned 912–13) and by his son Constantine VII.
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