Answer
Oda Nobunaga, a prominent daimyō during Japan's Sengoku period, was the master served by Yasuke, an African samurai. Yasuke's exceptional skills as a warrior and his unique physical appearance, being of African descent, caught Nobunaga's attention. Nobunaga, known for his open-mindedness and willingness to embrace foreign influences, welcomed Yasuke into his service, where he served as a bodyguard and advisor.