Sounds like a knockoff of James Clavell’s “Shogun”.
Which was loosely based on the historical exploits of William Adams!
https://www.amazon.com/Samurai-William-Englishman-Opened-Japan/dp/0142003786/ref=sr_1_2?crid=1P4BUZD2VTM81&keywords=samurai+william+the+englishman+who+opened+japan&qid=1674775395&sprefix=Samurai+willi%2Caps%2C126&sr=8-2