After castles other than main castles were abandoned by Ikkoku Ichijo Rei (Law of One Castle per Province) in1615, many daimyos who were newly promoted or who had their domains subdivided appeared, causing the lack of the sites to be given for building castles.
元和(日本)元年（1615年）一国一城令によって主城以外が破却された後、取立てられた家や分知大名が多数出現して与うるべき城地が不足する。