The third Shogun, Yoshimitsu ASHIKAGA, had a shogunal palace, the Hana no Gosho (Flower Palace) built for himself on Muromachi street in Kyoto, and successive generations of Shogun continued living there, leading to the Ashikaga Shoguns being called "Muromachi-dono" (the Lord of Muromachi), which led in turn to the bakufu being called the "Muromachi bakufu," and the period the "Muromachi period."
3代将軍足利義満が京都室町に花の御所を造営し歴代将軍が住んだ事から、足利将軍の事を室町殿（むろまちどの）と呼び、後に幕府を室町幕府、時代を室町時代と呼ぶようになった。