Kasa-gun including present-day Maizuru, came under the control of the Isshiki family, following Mitsunori ISSHIKI's rise to Shugoshoku (regional governor) of Tango Province after the establishment of the Muromachi bakufu (Japanese feudal government headed by a shogun).
室町幕府の成立によって一色満範が丹後国守護職となり舞鶴を含む加佐郡も一色家の統治下に置かれた。