Born in the East Blue, Zoro is the son of Tera and Roronoa Arashi, the grandson of Shimotsuki Furiko and Roronoa Pinzoro, and the grandnephew of Shimotsuki Ushimaru, making him a matrilineal descendant of both the Shimotsuki Family of Wano Country and the legendary samurai, Shimotsuki Ryuma.