 Soon after taking power, Yoritomo granted a samurai named Suwara Yoshitsura (from the Miura clan) all of Aizu.A descendant of Suwara, Ashina Morinori, began construction of the first castle in the city in 1384.During the Sengoku period the final lord of Aizu, Ashina Moritaka, died in 1583 and soon the Ashina clan lost power.