Overview: Hagi, in Yamaguchi Prefecture, western Japan, is one of Japan's best known castle towns. The traditional townscape with its stores and old houses has remained unchanged since the time of the Edo shoguns (1603-1868). The plan of the streets is so similar that you could use an Edo-period map to find your way around the town. Hagi was founded by the warlord Terumoto Mori, after he was forced to retreat following his defeat in the Battle of Sekigahara (1600). Despite its secluded location on the Japan Sea coast, surrounded by mountains, many leading figures who contributed to Japan's modernization were born here.