In 1620, Nagamasa ICHIHASHI was granted properties in both counties of Gamo and Yasu in Omi Province, and in Kawachi Province which bore 20,000 koku (1 koku was about 180 liter; an old unit showing volume) in total, and as a result, the Nishoji Domain was established.
元和(日本)6年（1620年）、市橋長政が近江国蒲生、野洲両郡と河内国内に合わせて2万石を与えられたことから、仁正寺藩が立藩した。