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1500 a.d. - 1200 a.d. = 300 years.
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750 AD was the 8th century (700-799).
He was not the first to discover it. Fibonacci lived around 1200 AD. He might have discovered it independently but it was known in India from 200 BC.
In 1200 AD, several significant events occurred. In Europe, construction of the Gothic-style Notre Dame Cathedral in Paris began. In Asia, the Mongol Empire expanded under Genghis Khan's leadership, conquering large parts of China and Central Asia. In the Americas, the indigenous people of the Ancestral Puebloans built elaborate cliff dwellings in what is now known as Mesa Verde National Park in Colorado.