Before Fukuchiyama was established as a domain, during the Sengoku Period (Period of Warring States), Mitsuhide implemented land-tax exemptions, developed the castle town, and constructed the early-modern Fukuchiyama-jo Castle.
福知山は、藩が成立する前の戦国時代、光秀の治世の下で地子銭免除や城下町建設、近世的な福知山城の築城などが行なわれている。