A small army and navy lacked training to face the British military
Byzantium/Constantinople was conquered in 1451, but the empire continued to decline starting around the 18th or 19th centuries. It officially died in WWI. As for how long it was a major threat to Europe, the empire's prime was the 16th century, under Suleiman the Magnificent.
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Charlemagne, or Charles the Great, was a powerful king who reunited most of Western Europe through his conquests. He was an able administrator and brought about economic reforms to bring prosperity in his kingdom. Charlemagne is famous for his work towards the development of education like building of schools and standardization of curriculum.
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