Matteo Ricci, an Italian Jesuit priest, arrives in China. He learned the Chinese language and adopted Chinese customs as to be accepted. He was granted entry to the Ming court thanks to his efforts. Around the time he arrived, the Ming began restoring the Great Wall of China to defend them from the renewed Mongol threat.
Great Wall of China: A fortified wall in northern China, extending some 1,500 miles from Kansu province to the Yellow Sea north of Beijing.