Nobunaga's Ambition
is a turn-based strategy video game series developed and published by Japanese video game company Koei. The series is set in Yuan Dynasty of China (12th - 14th century), and based on the first Emperor of Yuan Dynasty - Genghis Khan. The gameplay is similar as Koei's "Romance of the Three Kingdoms" and "Nobunaga's Ambition" series. The second and the third title were released in Western.