Leo the Mathematician
- Teacher and scholar; also called Leo the Philosopher. He was a nephew (or cousin) of John VII Grammatikos and metropolitan of Thessalonike (qq.v.) from 840-843. However, his fame rested on his knowledge of philosophy (q.v.) and mathematics, which attracted the attention of even the caliph Mamun (qq.v.). The caliph invited him to Baghdad (q.v.), but when Theophilos (q.v.) heard of the invitation he employed him to teach in the Magnaura (q.v.) palace. For Theophilos he built some remarkable automata (q.v.), as well as a beacon system (q.v.) that warned of Arab raids.
Historical Dictionary of Byzantium . John H. Rosser .
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