Hiroshima-jo was built by Mori Terumoto in 1591. Mori Terumoto was a very powerful daimyo who controlled the vast majority of the San'in and San'yo areas. Having outgrown his Yoshida-Koriyama castle he built a new castle at Hiroshima in 1599. Mori Terumoto aligned himself with the Western forces in the Battle of Sekigahara (1600). The Western forces lost and Mori's lands were confiscated. He was then appointed to govern most of what is modern day Yamaguchi prefecture.
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