Following the success of the Tokugawa at the Battle of Sekigahara the Mori Clan were stripped of most of their landholdings and moved their base from Hiroshima Castle to what is now Hagi in Yamaguchi Prefecture.
Construction of hagi castle began in 1604 and was completed in 1608
The Mori ruled here continuously until the Meiji Restoration and the castle was dismantled following the law of 1874 that decommissioned most Japanese castles.
All that remains now are the stone walls and base.