They thought it would learn slavery and lead to a new era
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.
The correct answer is "a good moral character. "
The teachings of Confucius emphasized the importance of a good moral character.
Confucius(551 BC-479 BC) was a Chinese philosopher. He taught his philosophy –Confucianism- that influenced Chinese culture until this day. He is considered a universal teacher for his principles of a virtuous life, devotion, and respect for the ancestors.
He considered rulers to be compassionate and benevolent, and humble. Confucius believed in the importance of high moral harmony standards in order to have peace of mind and body.
Confucianism is a philosophy that refers to morals and ethics in harmony with the universe. One important aspect is that rulers must lead by example. They must be benevolent in order to gain the respect of their people and to never use forcé because is counter-productive.