Sakai Tadatsugu

Sakai Tadatsugu (1527 – 17 December 1596) was one of Tokugawa Ieyasu's most favored and successful military commanders, and one of the Four Guardians of the Tokugawa alongside Honda Tadakatsu, Ii Naomasa and Sakakibara Yasumasa.

Reference

 * Assassin's Creed: Memories